summum genus
noun
summum ge·nus
| \ -ˈgānəs; -ˈjēnəs\
plural summa genera\ ¦su̇məˈgenərə , ¦süm- ; ¦səməˈjenərə \
Definition of summum genus
: a genus that can undergo logical division : a genus that cannot be classed as a species — compare tree of porphyry
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