/jee"neuhs/, n., pl. genera /jen"euhr euh/, genuses.1. Biol. the usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species.2. Logic. a class or group of individuals, or of species of individuals.3. a kind; sort; class.
* * *Biological classification.It ranks below family and above species, consisting of structurally or phylogenetically (see phylogenetic tree) related species or a single species exhibiting unusual differences. For example, the species of roses collectively form the genus Rosa and those of horses, donkeys, and zebras form the genus Equus. The genus name, capitalized and usually italicized, is the first word of a scientific name in the system of binomial nomenclature.
* * *▪ taxonbiological classification ranking between family and species, consisting of structurally or phylogenetically related species or an isolated species exhibiting unusual differentiation (monotypic genus). Thus the species of roses collectively form the genus Rosa, and the species of horses and zebras form the genus Equus. The genus name is the first word of a binomial scientific name (the species name is the second word) and is always capitalized. Thus the tea rose is Rosa odorata; the common horse is Equus caballus. See also species.
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