Definition of ascus in English:

ascus

Syllabification: as·cus
Pronunciation: /ˈaskəs
 
/

noun (plural asci /ˈasī, ˈaskī, -kē/)

Botany
A sac, typically cylindrical in shape, in which the spores of ascomycete fungi develop.
More example sentences
  • Hymenium - the spore-bearing layer of a fruiting body, containing asci, spores and paraphyses.
  • Spores were liberated from asci, and vegetative cells were killed, by treatment with glusulase and ethanol.
  • When mature, a perithecium contains several hundred asci that are ejected by turgor pressure.

Origin

mid 19th century: modern Latin, from Greek askos 'bag'.

Definition of ascus in:

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Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit