plural. Three children (or young) at a birth; triplets.

In various specific uses. plural. Three children at a birth; singular one of three at a birth.

plural. Three children or young born at one birth: = trine, n. 3. Also singular one of such; also attributive or as adj. Cf. thrin, n.

Three children at a birth. ? dialect.

concrete. plural. Three children at a birth; triplets.