Webster's English Dictionary

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lemma

1. lem.ma \'lem-*\ \'lem-*t-*\ n or lemmas or lem.ma.ta [L, fr. Gk le-mma 
   thing taken, assumption, fr. lambanein to take] pl  - more at LATCH 1: an 
   auxiliary proposition accepted as true for use in the demonstration o f 
   another proposition 2a: the heading or theme of a comment or note on a text 
    2b: a glossed word or phrase 
2. lemma n [Gk, husk, fr. lepein to peel - more at LEPER] : the lower of 
   the two bracts enclosing the flower in the spikelet of gras ses