What is "basionym"

n. (context botany taxonomy English) An earlier valid scientific name of a species that has since been renamed and from which the new name is partially derived.

In the scientific name of organisms, basionym or basyonym (from Greek βάσις basis "base" + ὄνυμα onyma "name") means the original name on which a new name is based. The term original combination is used in the same way in zoology. Bacteriology uses a similar term, basonym, spelled without an i.