Source : Webster's Revised Unabridged Dictionary (1913)

Glume \Glume\, 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 spikelt. --Gray.

Source : WordNet®

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