genus

noun

ge·​nus ˈjē-nəs  ˈje- 

plural genera ˈje-nə-rə  also genuses

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

Synonyms of genus

• type
• category
• kind
• species

Examples of genus in a Sentence

the crime novel, written from the criminal's perspective, is sometimes seen as a particular species of the detective story genus

Recent Examples on the Web

From 2012 to 2022 a research team collected observations of these unusual webs in Peru, the Philippines and Madagascar, focusing on about 300 individuals from the genus Cyclosa that are typically only a few millimeters long. —Gennaro Tomma, Scientific American, 19 Jan. 2026

This places the genus firmly among browsing herbivores, not grazing ones like horses. —Scott Travers, Forbes.com, 18 Jan. 2026

Azaleas and Rhododendrons Like other spring bloomers, shrubs in the Rhododendron genus bloom on one-year-old wood. —Andy Wilcox, Better Homes & Gardens, 12 Jan. 2026

Heather Hallen-Adams, the toxicology chair of the North American Mycological Association, previously told NBC News that death cap mushrooms look similar to other species in its genus, Amanita, that are often collected in Mexico and are safe to eat. —Aria Bendix, NBC news, 10 Jan. 2026

Word History

Etymology

Latin gener-, genus birth, race, kind — more at kin

First Known Use

1551, in the meaning defined at sense 1

Phrases Containing genus

• form genus
• type genus

Rhymes for genus

• cleanness
• freeness
• minas
• penis
• venous
• venus
• arteriovenous
• dominus
• fraxinus
• lupinus
• ricinus
• silenus

Kids Definition

genus

noun

ge·​nus ˈjē-nəs 

plural genera ˈjen-ə-rə 

: a category of classification in biology that ranks between the family and the species, contains related species, and is named by a capitalized noun formed in Latin

Medical Definition

genus

noun

ge·​nus ˈjē-nəs  ˈjen-əs 

plural genera ˈjen-ə-rə 

: 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 related species or an isolated species exhibiting unusual differentiation, and designated by a Latin or latinized capitalized singular noun