firstborn

English Wikipedia has an article on:

firstborn

Wikipedia

From first +‎ born.

• enPR: fûrstʹ-bôrn', IPA^(key): /ˈfɜː(ɹ)stˌbɔː(ɹ)n/
  • (UK) [ˈfɜːstˌbɔːn]
  • (US) [ˈfɝstˌbɔɚ̯n]
• Hyphenation: first‧born
• Rhymes: -ɜː(ɹ)stbɔː(ɹ)n

firstborn (plural firstborn or firstborns)

1. The first child to be born to a parent or family.

• (antonym(s) of “eldest child”): lastborn

• baby of the family
• middle child
• nextborn
• primogeniture

firstborn (not comparable)

1. Born as the first one in a family, flock or the like.
2. Most excellent; most distinguished or exalted.

• first-born

• (antonym(s) of “born first”): lastborn

• middleborn

• “firstborn”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.
• “firstborn”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.