'Jet ant' definitions:

Definition of 'Jet ant'

From: GCIDE

Jet \Jet\, n. [OF. jet, jayet, F. ja["i]et, jais, L. gagates, fr. Gr. ?; -- so called from ? or ?, a town and river in Lycia.] [written also jeat, jayet.] (Min.) A variety of lignite, of a very compact texture and velvet black color, susceptible of a good polish, and often wrought into mourning jewelry, toys, buttons, etc. Formerly called also black amber. [1913 Webster]
Jet ant (Zool.), a blackish European ant ({Formica fuliginosa}), which builds its nest of a paperlike material in the trunks of trees. [1913 Webster]