subgenusPronunciation: /ˈsʌbdʒɛnəs, -dʒiː-/Definition of subgenus noun (plural subgenera /-ˈdʒɛn(ə)rə/) Biology a taxonomic category that ranks below genus and above species. Derivatives subgenericPronunciation: /-dʒɪˈnɛrɪk/ adjective subgenus in other Oxford dictionaries Definition of subgenus in the US English dictionary