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Douglas Harper's Etymology Dictionary
ultralight

1959, from ultra- + light (adj.1). As a noun meaning "ultralight aircraft" it is recorded by 1979.

Wiktionary
ultralight

a. Extremely light; weighing very little, of utmost lightness. n. an aircraft that weighs very little

Usage examples of "ultralight".

The IMU cylinders were ultralight and slimline, weighing less than a single old-fashioned scuba set and ergonomically designed so they were hardly aware of the extra bulk.

Much of Crescent City was made of ultralight, ultrastrong buckyball material, material that responded quickly, although within preset parameters, to requests for change.

The American paratroopers had only one little 57-mm antitank gun, six bazookas, and the ultralight airborne 75-mm pack howitzer for artillery.

Beside them on the Central Plain the ultralight motor and the self-contained portable power station for the chairlift were already in operation.

All manner of contemporary river craft plied the languorous yet muscular stream: sailboats whose ultralight fabrics responded automatically to shifts in wind speed and direction,hovercraft built up out of ultralight composites, MAG barges which utilized the minute differences in electric charge between air and water to lumber along several centimeters above the surface of the water, big powerboats, tiny super fast pleasure craft, and land-based skimmers.

The work had been necessary in order to create a 150-foot flight strip for the Belgian's Aventura II 912 ultralight.

There was not much for so daunting an adventure: a change of clothes and underwear, socks, a flashlight laser, two water bottles, a knife -- I had specified the type -- in a belt scabbard, a heavy canvas jacket with thermal lining, an ultralight blanket to use as a bedroll, an inertial guidance compass, an old sweater, night-vision glasses, and a pair of leather gloves.

There was not much for so daunting an adventure: a change of clothes and underwear, socks, a flashlight laser, two water bottles, a knife-I had specified the type-in a belt scabbard, a heavy canvas jacket with thermal lining, an ultralight blanket to use as a bedroll, an inertial guidance compass, an old sweater, night-vision glasses, and a pair of leather gloves.

Rick woke him, then retired to his own ultralight but warm and comfortable mummy bag.

They understood at once that this was an ultralight interstellar probe, a starwisp, drifting out to explore the Galaxy by radiation pressure, surveying other stars and reporting back by radio to its makers on their home planet.

All the ultralight pilots have to do now, Pitt savvied, is circle over the boat and blast everyone to bloody bits.

He recognized it as an ultralight, a pusher-engined, high-winged monoplane with tricycle landing gear and tandem seats for two people.

We can keep a schooner on picket duty off Tartessos, and ultralights of course.

It held pictures, digital video shots from pre-Event cameras borne by the scouts in the ultralights, dropped onto the Chamberlain’s deck and run through the PC and printer in the radio shack.

Report from the ultralights the Farragut, ma’am, that smudge is the Farraguts smokestack!