FIRST'LING, adjective First produced; as firstling males. Deuteronomy 15:19. FIRST'LING, noun 1. The first produce or offspring; applied to beasts; as the firstlings of cattle. 2. The thing first thought or done. [Not used.] The very firstlings of my heart shall be the firstlings of my hand.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI