Thayer's
STRONGS NT 282: ἀμήτωρἀμήτωρ,
(ορος,
ὁ,
ἡ (
μήτηρ),
without a mother, motherless; in Greek writings:
1. born without a mother, e. g. Minerva, Euripides, Phoen. 666f, others; God himself, inasmuch as he is without origin, Lactantius, instt. 4, 13, 2.
2. bereft of a mother, Herodotus 4, 154, elsewhere.
3. born of a base or unknown mother, Euripides, Ion 109 cf. 837.
4. unmotherly, unworthy of the name of mother: μήτηρ ἀμήτωρ, Sophocles El. 1154. Cf. Bleek on Heb. vol. ii., 2, p. 305ff
5. in a significance unused by the Greeks, 'whose mother is not recorded in the genealogy': of Melchizedek, Hebrews 7:3; (of Sarah by Philo in de temul. § 14, and rer. div. haer. § 12; (cf. Bleek as above)); cf. the classic ἀνολυμπιάς.