Dictionary  lem•maPronunciation: (lem'u), [key] —n., —pl. lem•mas, lem•ma•taPronunciation: (lem'u-tu). [key] 1. a subsidiary proposition introduced in proving some other proposition; a helping theorem. 2. an argument, theme, or subject, esp. when indicated in a heading. 3. a word or phrase that is glossed; headword. lem•maPronunciation: (lem'u), [key] —n., —pl. lem•mas. Bot. a bract in a grass spikelet just below the pistil and stamens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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