Firstling /(fẽrst"lĭng)/

First·ling

Firstling

n.
  1. The first produce or offspring; -- said of animals, especially domestic animals; as, the firstlings of his flock.
  2. The thing first thought or done.
    The very firstlings of my heart shall be The firstlings of my hand.

Firstling

a.
  1. Firstborn.
    All the firstling males.