society > society and the community > kinship or relationship > kinsman or relation > child > relationship to parent > [adjective] > next-born, last-born, etc. (4)
Designating the second in age of three siblings. Similarly (colloquial) middle one. In Middle English also in superlative.
(a) adj. last-born, youngest; (b) n. a youngest child or sibling; cf. eldest-born n. at eldest, adj. compounds; also in extended use.
Last among the offspring born to a particular parent or particular parents or at a particular multiple birth; youngest. Also figurative and in…