bastard eigne

[ eyn ]
/ eɪn /

noun Old English Law.

the first-born illegitimate son of parents whose second son was legitimate.
Compare mulier puisne.

Origin of bastard eigne

1580–90; eigne < Anglo-French: elder, Old French ainsné ( ainz before (< Vulgar Latin *antius, for Latin anteā) + ne born; see nee)