GRC
Bailly
ων (τὰ) var. c. πρωτοτοκεῖα.
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LSJ
τά, with v.l. πρωτοτοκτοκεῖα, rights of the first-born, birthright, LXX Ge. 25.32, Ep. Hebr. 12.16.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
πρωτοτόκια, -ων, τά
(< πρωτότοκος) [in LXX (with seel. -εῖα, -εία): Gen.25:31 ff. Gen.27:36, Deu.21:17, 1Ch.5:1 (בְּכוֹרָה) * ;]
the rights of the first-born, birthright (= cl. ἡ πρεσβεία): Heb.12:16.†
(AS)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars