Meaning of middle-born

mid•dle-born

Pronunciation: (mid'l-bôrn"), [key]
— adj.
  1. neither first nor last in order of birth, esp. second in a family of three children.
—n.
  1. a middle-born child.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.