species

spe·cies

noun \ˈspē-(ˌ)shēz, -(ˌ)sēz\

plural species

Definition of SPECIES

1

a : a category of biological classification ranking immediately below the genus or subgenus, comprising related organisms or populations potentially capable of interbreeding, and being designated by a binomial that consists of the name of the genus followed by a Latin or latinized uncapitalized noun or adjective agreeing grammatically with the genus name b : an individual or kind belonging to a biological species

2

: a particular kind of atomic nucleus, atom, molecule, or ion <production of DNA damage by active oxygen species>