Hemiascomycetes he·mias·co·mycetes uncommon noun 1. class of fungi in which no ascocarps are formed: yeasts and some plant parasites Synonymsclass Hemiascomycetes Related words Broader terms class Parts Ascomycota Part of Endomycetales WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.