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Webster 1913 Edition

Noun.

;

pl. Asci

[NL., fr. Gr. [GREEK] a bladder.]

(Bot.)

A small membranous bladder or tube in which are inclosed the seedlike reproductive particles or sporules of lichens and certain fungi.

See also: Ascus

asci containing fungal spores.

ascus ‎(plural asci)

A sac-shaped cell present in ascomycete fungi; it is a reproductive cell in which meiosis and an additional cell division produce eight spores.
- 1967, Constantine. J. Alexopoulos & Harold C. Bold, Algae and Fungi, p.101,
  The one important character which distinguishes the Ascomycetes from all other fungi is the ascus (plural, asci). This is a sac-like structure in which ascospores are formed following karyogamy and meiosis.

terms derived from ascus

a sac-shaped cell present in ascomycete fungi