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The Collaborative International Dictionary

Trapezoid \Trap"e*zoid\, n. [Gr. ? trapezoid-shaped; ? table + ? shape, likeness: cf. F. trap['e]zo["i]de. See Trapezium.]

  1. (Geom.) A plane four-sided figure, having two sides parallel to each other.

  2. (Anat.) A bone of the carpus at the base of the second metacarpal, or index finger.


Trapezoid \Trap"e*zoid\, a.

  1. Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.

  2. (Anat.) Of or pertaining to the trapezoid ligament; as, the trapezoid line.

Douglas Harper's Etymology Dictionary

1706, "a trapezium," from Modern Latin trapezoides, from Late Greek trapezoeides, noun use by Euclid of Greek trapezoeides "trapezium-shaped," from trapeza, literally "table" (see trapezium), + -oeides "shaped" (see -oid). Technically, a plane four-sided figure with no two sides parallel. But in English since c.1800, often confused with trapezium in its sense of "a quadrilateral figure having only sides parallel and two not."


n. 1 (context geometry US English) A (convex) quadrilateral with two (non-adjacent) parallel sides. 2 (context geometry British English) A convex quadrilateral with no sides parallel and no equal sides. 3 (context anatomy English) The trapezoid bone of the wrist.

  1. n. a quadrilateral with two parallel sides

  2. the wrist bone between the trapezium and the capitate bones [syn: trapezoid bone, os trapezoideum]


In Euclidean geometry, a convex quadrilateral with at least one pair of parallel sides is referred to as a trapezoid (pronounced: /ˈtɹæpəzɔɪd/) in American and Canadian English but as a trapezium in English outside North America. The parallel sides are called the bases of the trapezoid and the other two sides are called the legs or the lateral sides (if they are not parallel; otherwise there are two pairs of bases). A scalene trapezoid is a trapezoid with no sides of equal measure, in contrast to the special cases below.

Trapezoid (band)

Trapezoid is an American folk music group led by Paul Reisler. Founded in 1975 by Sam Rizzetta and Reisler, they began as a quartet of hammer dulcimer players. Two of the four played the traditional hammer dulcimer, while the other two played baritone and treble hammer dulcimers specially designed by Rizzetta. The name of the band reflects the shape of the hammer dulcimer. Since 1975, the group's membership and instrumentation has changed repeatedly, always with Paul Reisler as a member. Their sound has been described as a "plinking and plunking, buzzing, sweeping, ringing, droning, and wailing acoustic construction" and as "a delightful musical melange" by the New York Times.

In 2004 and 2005, the 1984 lineup that recorded Winter Solstice with John McCutcheon reunited with McCutcheon to perform acoustic concerts, called the Winter Solstice tour. This lineup included fiddler Freyda Epstein, who was killed in 2003 in a car accident1 bringing the band to a tragic end.

Reisler has gone on to form a new band, Paul Reisler and A Thousand Questions, and to form the Kid Pan Alley children's songwriting project.

Trapezoid (disambiguation)

Trapezoid may refer to:

  • Trapezoid or trapezium, a geometric figure
  • Trapezoid bone, a bone in the hand
  • Trapezoid (band), an American folk music group
  • Goaltender trapezoid, an area of a hockey rink
  • Trapezoid, a former musical project of Neil Cicierega before he formed Lemon Demon

Usage examples of "trapezoid".

Arcas hunkered down and contemplated the flat trapezoid, which was three meters across at its base.

The embedded circuit lines in the rock walls carried the necessary power to the flat trapezoid that held only an opaque stone surface.

Meanwhile, Margaret stared as the stone trapezoid crackled and fuzzed with static.

The coca leaves are grown in Peru and Bolivia, then flown or shipped down the Amazon to Leticia and transported to factories in the Trapezoid, where cocaine is made.

He knew there was nothing he could say to talk her out of going to the Trapezoid with him, and he was glad.

West handed Big Ears the priceless golden trapezoid, which the big man placed inside a sturdy backpack.

CIEF assassin opened it with his foot, saw the glistening golden trapezoid inside.

Searching for a golden trapezoid in there would be like searching for a needle in a mountain of haystacks.

A sudden light from the Avery bedroom projects a long yellow trapezoid over the spiky grass.

Then Pincushion, where everyone lived on huge long pins, and Spiral, like a little galaxy, Tangle, like knots in spaghetti, Motes, which seemed to be a swarm of particles, Trapezoid, which was not exactly cubic, and Shoe.

In addition to introducing the Symbiotic Trapezoid Quote as the wave of the future in journalism, I have some other ideas to get into: mainly about Richard Nixon, and some of these are ugly.

I remember the light on the wall, a big trapezoid of yellow getting narrower until the door clicked shut, and there was only a thin line of light from the crack.

Judah, racing back down the entry tunnel with the two large golden trapezoids in their midst.

There was an assortment of shapes, too: deranged trapezoids, overweight butterflies, giant beer cans.

The Tech Center rose in a jumble off to the left, beer cans and trapezoids, and then there was a long curve of isolated buildings all the way to downtown, an island of skyscraping towers obviously in need of a moratorium.