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Longman Dictionary of Contemporary English
rocker
noun
COLLOCATIONS FROM CORPUS
■ ADJECTIVE
punk
▪ For one thing, these three women are cheerful and polite, with none of the surliness characterizing other punk rockers.
■ NOUN
switch
▪ Most simply replace the existing rocker switch, but can not be used for controlling the fluorescent lighting.
▪ Install large rocker switches or paint switches a contrasting color.
▪ Last comes the master volume rotary, with the mains rocker switch located to the far right.
▪ Next in line is a tri-function rocker switch to switch between high power, low power or standby modes.
▪ A rocker switch allows them to turn the rear wheels; the trucks all have four-wheel steering.
EXAMPLES FROM OTHER ENTRIES
rocker Carl Perkins
EXAMPLES FROM CORPUS
▪ Five chairs, one broken, one a rocker.
▪ Have you finally gone off your rocker?
▪ What is it about soundtrack projects that makes hard rockers want to change their tune?
The Collaborative International Dictionary
rocker

Rock shaft \Rock" shaft`\ [Cf. Rock, v. i.] (Mach.) A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft.

rocker

Cradle \Cra"dle\ (kr[=a]d'l), n. [AS. cradel, cradol, prob. from Celtic; cf. Gael. creathall, Ir. craidhal, W. cryd a shaking or rocking, a cradle; perh. akin to E. crate.]

  1. A bed or cot for a baby, oscillating on rockers or swinging on pivots; hence, the place of origin, or in which anything is nurtured or protected in the earlier period of existence; as, a cradle of crime; the cradle of liberty.

    The cradle that received thee at thy birth.
    --Cowper.

    No sooner was I crept out of my cradle But I was made a king, at nine months old.
    --Shak.

  2. Infancy, or very early life.

    From their cradles bred together.
    --Shak.

    A form of worship in which they had been educated from their cradles.
    --Clarendon.

  3. (Agric.) An implement consisting of a broad scythe for cutting grain, with a set of long fingers parallel to the scythe, designed to receive the grain, and to lay it evenly in a swath.

  4. (Engraving) A tool used in mezzotint engraving, which, by a rocking motion, raises burrs on the surface of the plate, so preparing the ground.

  5. A framework of timbers, or iron bars, moving upon ways or rollers, used to support, lift, or carry ships or other vessels, heavy guns, etc., as up an inclined plane, or across a strip of land, or in launching a ship.

  6. (Med.)

    1. A case for a broken or dislocated limb.

    2. A frame to keep the bedclothes from contact with the person.

  7. (Mining)

    1. A machine on rockers, used in washing out auriferous earth; -- also called a rocker. [U.S.]

    2. A suspended scaffold used in shafts.

  8. (Carp.) The ribbing for vaulted ceilings and arches intended to be covered with plaster.
    --Knight.

  9. (Naut.) The basket or apparatus in which, when a line has been made fast to a wrecked ship from the shore, the people are brought off from the wreck.

    Cat's cradle. See under Cat.

    Cradle hole, a sunken place in a road, caused by thawing, or by travel over a soft spot.

    Cradle scythe, a broad scythe used in a cradle for cutting grain.

Douglas Harper's Etymology Dictionary
rocker

"a rocking chair," 1852, American English, from rock (v.1); earlier "nurse charged with rocking a cradle" (early 14c.). In sense of "one of the curved pieces of wood that makes a chair or cradle rock" it dates from 1787. Slang off (one's) rocker "crazy" first recorded 1897. Meaning "one who enjoys rock music" (as opposed to mod (n.1)) is recorded from 1963, from rock (v.2).

Wiktionary
rocker

n. 1 A curved piece of wood attached to the bottom of a rocking chair or cradle that enables it to rock back and forth. 2 Hence, a rocking chair 3 (context surfing English) The lengthwise curvature of a surfboard. (More rocker is a more curved board.) 4 Someone passionate about rock music. 5 A musician who plays rock music. 6 (context informal English) A rock music song. 7 One who rocks something. 8 (context UK English) A member of a British subculture of the 1960s, opposed to the mods, who dressed in black leather and were interested in 1950s music. 9 Any implement or machine working with a rocking motion, such as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water. 10 A rocking horse. 11 A skate with a curved blade, somewhat resembling in shape the rocker of a cradle. 12 (context engineering English) A rock shaft.

WordNet
rocker
  1. n. an attendant who rocks a child in a cradle

  2. a performer or composer or fan of rock music [syn: rock 'n' roll musician]

  3. a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles

  4. a chair mounted on rockers [syn: rocking chair]

  5. a trough on rockers used by gold miners to shake earth in water in order to separate the gold [syn: cradle]

  6. an ice skate with a curved blade

  7. a curved support that permits the supported object to rock to and fro

Wikipedia
Rocker (subculture)
Rocker

Rocker or rockers may refer to:

Rocker (album)

Rocker is the third studio album by Serbian heavy metal band Kraljevski Apartman. For the first time in the band's history, an official keyboard player was brought in substituting the second guitar. The band presented a heavy but at the same time a melodic approach to their music with heavy- riff songs and power ballads. The band recorded eleven new songs plus one bonus track from Labyrinth movie soundtrack. The album featured ballad "Dama iz kraljevskog apartmana" which became their stamp for the future, "Ranjena zver" (for which the band recorded a promotional video), glam metal-oriented "Vino, viski i Rock 'n' Roll" and "Za ljubav ne treba da moliš" which became classics and considered unskipable on live appearances. The track "Niemansland" was written in German language and Zdravković provided the vocals. This is the first Kraljevski Apartman track on foreign language and not sung by Lalović.

Rocker (laboratory)

A rocker is a device used in laboratories for molecular and biological mixing applications. Rockers are often used in place of shakers when less aggressive mixing is required.

Rockers are commonly used for staining and de-staining gels after electrophoresis, hybridization, washing, blotting, Cell culture and gentle mixing.

Two-dimensional rockers use a platform that moves in a seesaw motion to create waves in liquid laboratory samples. Three-dimensional rockers move a platform in a three-dimensional gyratory motion to create a gentle swirling of samples.

Typical features of laboratory rockers include variable speeds, and tilt angles. Rockers are often designed to accept stackable platforms or may be outfitted with multiple tiers to increase capacity without increasing the footprint. Platform surfaces are usually covered with rubber pads to prevent objects from slipping during operation.

Usage examples of "rocker".

On the abutment towers the chains are connected by horizontal links, carried on rockers, to anchor ties.

Now and then, however, it got some baddish cases, people who were almost off their rocker, and I fancied that Brumby was one.

There were no Regency bucks there tonight, however, just a couple of dozen ageing rockers with a fascinating array of bimbettes on their knees, arms or various other parts of their anatomy.

With a scratched upright piano, a long, bare table, a cushionless window seat and a litter of third-hand chairs, rockers and wicker and canvas deck-chairs, the room was a charity home.

No sooner had Tom arrived, complete with his rocker, cot, playpens and goodness knows what else, than Katherine announced that she too was moving back home with her baby because her gobshite of a husband had left, this time for good.

Ole Golly turned the light out and Harriet listened to her go back into her room which was right across the hail, pick up her book, and sit down in the rocker again.

It started, in fact, as a wonderful dream in which Ole Golly, seated in a rocker and wearing a warm yellow flannel bathrobe, rocked Harriet on her lap as she held her very close.

And then, after my new plush rocker was set in the middle of the room, after they brought in my radio and straightened the place around, after my boys toasted me with beers and left for the Lamartine homesite once more, I sat there.

He turned Mattie onto her side, and then with Mattie lying on the kitchen floor holding onto the lower ridge of a bottom cabinet door, Lamar pried the rocker apart and pulled it from around her.

She brought Lamar his food and drink and then went back and got a board for the rocker seat, put it across the seat, and sat down.

Grandma Mazur in the Lay-Z-Boy rocker and reasure my mother that nothing terrible had happened to us on Stark Street .

He admitted once having met Salchow, who had improved on the star figure invented by Englemann, the star of four crosses, forward rocker, back loop, back counter.

Roxanne Faught had turned her front porch into an outdoor room, with pale sisal carpet, a dark green painted porch swing, two white wicker rockers, occasional tables, and a double-sided magazine rack, one half stuffed with issues of People and the other with copies of Better Homes and Gardens.

They were waiting on the porch, Smetana in his rocker as though he had never left it, gray sweater over his shoulders, when Ralph and John and Fillmore came trudging up the hill.

And I could sit tight at home out on the front porch in a rocker with my boot heels up on the railing while they had another Smokey the Bear santo riot, or did you forget about that?