Sac in which seed spores grow

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• Spore sac
• Spore case
• Saclike structure in which ascospores are formed through sexual reproduction of ascomycetes

Wiktionary Word definitions in Wiktionary
n. A sac-shaped cell present in ascomycete fungi; it is a reproductive cell in which meiosis and an additional cell division produce eight spores.

Wikipedia Word definitions in Wikipedia
The ascus is a diagnostic morphological feature of the bryozoan suborder Ascophora (hence the name of the suborder). It is a water-filled sac of frontal membrane opening (ascopore) at or near the zooid orifice. It functions as a hydrostatic system by allowing ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"sac in certain fungi," 1830, Modern Latin, from Greek askos "leather bag, wine skin," which is of unknown origin.

WordNet Word definitions in WordNet
n. saclike structure in which ascospores are formed through sexual reproduction of ascomycetes [also: asci (pl)]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ascus \As"cus\, n.; pl. Asci. [NL., fr. Gr. ? a bladder.] (Bot.) A small membranous bladder or tube in which are inclosed the seedlike reproductive particles or sporules of lichens and certain fungi.