Definition of ascus in English:

ascus

noun

Botany
  • A sac, typically cylindrical in shape, in which the spores of ascomycete fungi develop.

    asci
    • ‘When mature, a perithecium contains several hundred asci that are ejected by turgor pressure.’
    • ‘Spores were liberated from asci, and vegetative cells were killed, by treatment with glusulase and ethanol.’
    • ‘Hymenium - the spore-bearing layer of a fruiting body, containing asci, spores and paraphyses.’
    • ‘No mutants had significant numbers of asci with more than four spores.’
    • ‘Fully developed ascospores within intact asci could be identified by their red pigmentation.’

Origin

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

Pronunciation:

ascus

/ˈaskəs/