glume


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
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