first-begotten
/ˈfəːs(t)bɪˌɡɒtn/adjective
Designating a child who is the first to be procreated; firstborn.
noun
Usually with the or possessive adjective. The first-begotten child, the firstborn. Also treated as plural: those who are first-begotten.
Origin
Late Middle English; earliest use found in The Midland Prose Psalter. From first + begotten, originally after post-classical Latin primogenitus, adjective and noun.