[ 'askəs ]
■ noun ( plural asci 'askʌɪ , -i: ) Botany a sac in which the spores of ascomycete fungi develop.
Origin
C19: mod. L., from Gk askos 'bag'.
ASCUS
Meaning of ASCUS in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004