NCIt definition : Various single-celled members of the fungal families, ascomycetes, basidiomycetes
and imperfect fungi that tend to be unicellular for the greater part of their life
cycle.;
Alternative definition : CDISC: Any of various single-celled ascomycetes, basidiomycetes and imperfect fungi
with little or no mycelium development that asexually reproduce by budding. They ferment
sugars to produce alcohol and carbon dioxide.; NICHD: A unicellular fungus that reproduces by mitosis or budding.;