glume n 1: small dry membranous bract found in inflorescences of Gramineae and Cyperaceae
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