Bailly
c. πίννη.
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LSJ
(Antiph. 194.15) and πῖνα, ἡ, pinna, a long-shaped bivalve, with a silky beard or byssus, of which several species inhabit the Mediterranean, freq. mentioned as a delicacy in Com. Poets, e.g. Cratin. 8, Philyll. 13, cf. Arist. HA 528a24, 547b15, Isid. Char. 20, Oppian. H. 2.187, Artem. 2.14.
pearl, acc. pl. πίνας UPZ 121.9 (ii BC); πείνας POxy. 1273.10 (iii AD), cf. ἀληθινόπινος, πινώτιον, πινάριον. — Written with one ν, UPZ l.c., POxy. l.c., and sts. in codd., cf. Cic. Fin. 3.63, ND 2.123, Plin. HN 9.115, 142; πῖνα Hdn. Gr. 2.570, Hsch., Choerob. in An.Ox. 2.250; the spelling πινν- in this word and its derivatives is freq. in codd., but is not found in Inscrr. or Papyri.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)