ascus [ as-k uh s ] SHOW IPA / ˈæs kəs / PHONETIC RESPELLING EXAMPLES | WORD ORIGIN noun, plural as·ci . [ as-ahy, -kahy, -kee] /ˈæs aɪ, -kaɪ, -ki/ . Mycology the sac in ascomycetes in which the sexual spores are formed. Origin of ascus 1820–30; < New Latin < Greek askós bag, sac
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for ascus
Some of these are indefinite in the number contained in an
ascus, although the majority are eight, and a few less.
The single nucleus divides by three successive divisions to form eight nuclei lying free in the protoplasm of the
By crushing the ripe spore fruit, these spores still enclosed in the mother cell (
ascus) may be forced out (Fig. 39, H).
In this group the spores are formed in minute club-shaped sacs, known as asci (singular,
ascus). British Dictionary definitions for ascus noun plural asci ( ˈæsaɪ, ˈæskaɪ) a saclike structure that produces (usually) eight ascospores during sexual reproduction in ascomycetous fungi such as yeasts and mildews Word Origin for ascus
C19: from New Latin, from Greek
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for ascus n.
"sac in certain fungi," 1830, Modern Latin, from Greek
askos "leather bag, wine skin," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for ascus n. pl. as•ci ( ăs) ′ī′, -kī′ A membranous, often club-shaped structure in which typically eight spores are formed through sexual reproduction of ascomycetes.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for ascus Plural asci ( ăs) ′ī′, -kī′ A membranous, often club-shaped structure inside which ascospores are formed through sexual reproduction in species of the fungi known as ascomycetes. The ascus is unique to ascomycetes and distinguishes them from other kinds of fungi. Asci are formed when two hyphae that are sexually compatible conjugate. Each ascus typically develops eight ascospores. Asci swell at maturity until they burst, shooting the ascospores into the air.
The American Heritage® Science Dictionary
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