Definition of species:

part of speech: noun

A sort; a kind; a race; a group of individuals or objects sufficiently identical in all their natural qualities to justify the conclussion that they may have sprung from a common stock; a collection of like individuals produced by other individuals equally like them; a rank subordinate to a genus; a group of individuals agreeing in common attributes, and designated by a common name; in med., the component part of a compound medicine.