Strong's Definition
feminine from 1069; the eldest daughter
KJV Usage: firstborn
STEPBible — Tyndale Abridged Hebrew Lexicon
בְּכִירָה (be.khi.rah) — firstborn. 1) firstborn daughter, firstborn (of women) 1a) always used of women
UBS Dictionary of Biblical Hebrew
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
בְּכִירָה n.f. first-born, always of women base