(1):
(n.) Any beetle of the family Elateridae, having the habit, when laid on the back, of giving a sudden upward spring, by a quick movement of the articulation between the abdomen and thorax; - called also click beetle, spring beetle, and snapping beetle.
(2):
(n.) The caudal spring used by Podura and related insects for leaping. See Collembola.
(3):
(n.) The active principle of elaterium, being found in the juice of the wild or squirting cucumber (Ecballium agreste, formerly Motordica Elaterium) and other related species. It is extracted as a bitter, white, crystalline substance, which is a violent purgative.
(4):
(n.) An elastic spiral filament for dispersing the spores, as in some liverworts.
(5):
(n.) One who, or that which, elates.