Elater (?), n. One who, or that which, elates.
[1913 Webster]

Elater (?), n. (Chem.) 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.
[1913 Webster]