A small club-shaped structure typically bearing four basidiospores at the ends of minute projections

• Unique to basidiomycetes

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Basidium \Ba*sid"i*um\, n. [NL., dim. of Gr. ba`sis base.] (Bot.) A special oblong or pyriform cell, with slender branches, which bears the spores in that division of fungi called Basidiomycetes, of which the common mushroom is an example.

Wikipedia Word definitions in Wikipedia
thumb|right|500px|Schematic showing a basidiomycete mushroom, gill structure, and spore-bearing basidia on the gill margins. A basidium (pl., basidia ) is a microscopic, spore-producing structure found on the hymenophore of fruiting bodies of basidiomycete ...

WordNet Word definitions in WordNet
n. a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes [also: basidia (pl)]

Wiktionary Word definitions in Wiktionary
n. (context mycology English) A small structure, shaped like a club, found in the Basidiomycota division of fungi, that bears four spores at the tips of small projections.