ASCUS Meaning of ASCUS in English /as"keuhs/ , n. , pl. asci /as"uy, -kuy, -kee/ . Mycol.the sac in ascomycetes in which the sexual spores are formed. [ 1820-30; askós bag, sac ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012