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1. A bract, usually one of two, at the base of a grass spikelet.
2. A bract in a sedge spikelet, usually subtending a floret.

[Latin glūma, husk; see gleubh- in Indo-European roots.]

glu·ma′ceous (glo͞o-mā′shəs) adj.
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References in periodicals archive ?
Different types of bracts may be recognize in the inflorescence: (1) foliaceous, with a well-developed blade and a scarcely or not developed sheath; (2) setiform, without a sheath, the leaf blade enlarges at the base but the mid and upper portions are narrow and stretched (setalike), sometimes acuminate; and (3) glumaceous, similar to a glume, but with a short setiform appendix.
Because of this, the main axis may show, in acropetal succession, all three types of bracts (foliaceous-setiform-glumaceous), or two types (foliaceous-glumaceous, setiform-glumaceous) or only the glumaceous type.
All of them are two-keeled, a hardly observable character in the glumaceous ones.