(lem′ə) noun plural lem·mas or lem·ma·ta (lem′ə·tə)
1. A subject or theme assumed for treatment, as in verse.
2. Logic a A subsidiary proposition employed as auxiliary in demonstrating another one. b A proposition assumed to be true. [<L <Gk. lēmma something taken, a premise <lēmm-, stem of lambanein take]

(lem′ə) noun Bot.
A small, chaffy bract inside and above the glumes in a spikelet of grass. [<Gk. lemma a husk <lepein peel]