Genus

n. category in which living organisms with common characteristics are classified (Biology); category, class, kind

A genus (plural: genera) is part of the Latinized name for an organism. It is a name which reflects the classification of the organism by grouping it with other closely similar organisms. A genus is a category name that is given to every species in a group of species which are closely related to one another. Ideally the same generic name is given to species which are all descended from a common ancestor. In other words, a genus is a low-level taxonomic unit, used in the classification of living and fossil organisms.
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n. gender, sex of a person or animal; system in some languages in which nouns are separated into two or more groups; such a group of nouns

n. genus, category in which living organisms with common characteristics are classified (Biology); category, class, kind

(n.)
An assemblage of species, having so many fundamental points of structure in common, that in the judgment of competent scientists, they may receive a common substantive name. A genus is not necessarily the lowest definable group of species, for it may often be divided into several subgenera. In proportion as its definition is exact, it is natural genus; if its definition can not be made clear, it is more or less an artificial genus.
  

(n.)
A class of objects divided into several subordinate species; a class more extensive than a species; a precisely defined and exactly divided class; one of the five predicable conceptions, or sorts of terms.