Simile

King James Dictionary

Simile, n. sim'ily. L. In rhetoric, similitude a comparison of two thing which, however different in other respects, have some strong point or points of resemblance by which comparison, the character or qualities of a thing are illustrated or presented in an impressive light. Thus, the eloquence of Demosthenes was like a rapid torrent that of Cicero, like a large stream that glides smoothly along with majestic tranquility.

Webster's Dictionary

(n.) A word or phrase by which anything is likened, in one or more of its aspects, to something else; a similitude; a poetical or imaginative comparison.