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From The Collaborative International Dictionary of English v.0.48:
Glume \Glume\ (gl[=u]m), n. [L. gluma hull, husk, fr. glubere to bark or peel: cf. F. glume or gloume.] (Bot.) The bracteal covering of the flowers or seeds of grain and grasses; esp., an outer husk or bract of a spikelet. --Gray. Glumella