Elater

noun

1. An elaterid beetle.
2. A tiny elongated structure that forces the dispersal of spores by the absorption of moisture. It is either a band attached to the spore, as in horsetails, or a filament occurring among the spores, as in liverworts.
3. One who or that which elates.
4. Elasticity; especially, the expansibility of a gas.
5. [NL.] In botany: One of the four clubshaped filaments of Equisetaceæ, attached at one point to a spore, formed by the splitting of the outer coat of the spore.