Elater n. : One who, or that which, elates.

Elater n. : An elastic spiral filament for dispersing the spores, as in some liverworts.

Elater 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.

Elater n. : The caudal spring used by Podura and related insects for leaping. See Collembola.

Elater 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.

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Taxonomy
spores, cells, Elater, free encyclopedia, plant spores, horsetail, New York, appendages, sporophyte, maturity, stick, Land Plants, click beetle, beetle genus, spore wall, spore dispersal, search, common name.

Defination from the web:
elater is a cell (or structure attached to a cell) that is hygroscopic, and therefore will change shape in response to changes in moisture in the environment. ... In the hornworts, elaters are branched clusters of cells that develop in the sporophyte alongside the spores. ...