Suet \Su"et\, n. [OE. suet, dim. fr. OF. seu, suif, F. suif, L. sebum. Cf. Soap, Sebaceous.]

The fat and fatty tissues of an animal, especially the harder fat about the kidneys and loins in beef and mutton, which, when melted and freed from the membranes, forms tallow.

Source: Webster's Revised Unabridged Dictionary (1913)