Definition of genus
1
: a class, kind, or group marked by common characteristics or by one common characteristic
specifically
: a category of biological classification ranking between the family and the species, comprising structurally or phylogenetically (see phylogenetic sense 2) related species or an isolated species exhibiting unusual differentiation, and being designated by a Latin or latinized capitalized singular noun
2
: a class of objects divided into several subordinate species
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Merriam-Webster unabridged
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Time Traveler for genus
The first known use of genus was in 1551
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