Strong’s Greek
G282 — ametor
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀμήτωρ
ametor — pronounced am-ay'-tore
from 1 (as a negative particle) and 3384; motherless, i.e. of unknown maternity:--without mother. see GREEK for 1 see GREEK for 3384
1 occurrence in the KJV.
Hebrews 7:3
Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.