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