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Possible definitions for juck

cuckoo
Any of some 60 species of tree-dwelling birds (family Cuculidae) and numerous terrestrial species found worldwide in temperate and tropical regions but most diverse in the Old World tropics. Species range from 6.5 to 36 in. (16-90 cm) long. Most are drab gray, but a few are partially or completely brightly colored or iridescent. Aside from the European cuckoo's familiar two-note call, cuckoos are best known for their habit of brood parasitism (see cowbird); their eggs resemble those of the host species (egg mimicry), and the adult cuckoo removes one or more host eggs to ensure that the substitution is indetectable (the newly hatched cuckoo may also eject eggs or nestlings).


duck
Any of various relatively small, short-necked, large-billed waterfowl (several genera in subfamily Anatinae, family Anatidae). The legs of true ducks (Anatinae) are placed rearward (as are those of swans), resulting in a waddling gait. Most true ducks differ from swans and true geese in that male ducks molt twice annually, females lay large clutches of smooth-shelled eggs, and both sexes have overlapping scales on the skin of the leg and exhibit some differences between sexes in plumage and in call. All true ducks except shelducks and sea ducks (see diving duck) mature in the first year and pair only for the season. They are generally divided into three groups: perching ducks, dabbling ducks, and diving ducks. The whistling duck species, also called tree ducks, are not true ducks but are more closely related to geese and swans.


jack
In practical mechanics, portable hand-operated device for raising heavy weights through short distances, exerting great pressures, or holding assembled work firmly in position. The ratio of the load to the amount of force applied to the handle can be made quite high by using a gear or screw to regulate the upward extension. A ratchet allows a heavy weight to be raised in short successive stages. Though limited by the requirements of portability and ease of manual operation, jacks may lift, or exert a force of, several tons. A familiar example is the automobile jack, used to raise one end of a car to change a tire.

Any of more than 150 species of fishes (family Carangidae, order Perciformes) found in temperate and tropical portions of the Atlantic, Pacific, and Indian oceans and occasionally in fresh or brackish water. Though body size and shape vary greatly, many species have small scales that create a smooth appearance, a laterally compressed body, rows of large spiky scales along the side near the tail fin, and a deeply forked tail. Many have a bluish green, silvery, or yellowish sheen. Jacks are important commercially and are favored sport fishes. See also amberjack.

In practical mechanics, portable hand-operated device for raising heavy weights through short distances, exerting great pressures, or holding assembled work firmly in position. The ratio of the load to the ...

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