genus (n.) Look up genus at Dictionary.com
(Latin plural genera), 1550s as a term of logic, "kind or class of things" (biological sense dates from c. 1600), from Latin genus (genitive generis) "race, stock, kind; family, birth, descent, origin," from suffixed form of PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups.