Liddell-Scott-Jones

ὄστρακον (ostrakon) a potsherd ^G:N-N

ὄστρακον, τό,

earthen vessel, [Refs 5th c.BC+]; flower-pot, [Refs 4th c.BC+]

__2 fragment of such a vessel, potsherd, [LXX+5th c.BC+]; especially the potsherd used in voting (see. ὀστρακίζω): hence τοὔστρακον παροίχεται the danger of ostracism is past, [Refs 5th c.BC+]; τὰ ὄστρακα, ={ὀστρακισμός}, [Refs 5th c.BC+]; τὸ ὄ. ἐπιφέρειν τινί to vote for any one's banishment, [Refs 1st c.AD+]
__3 ὀστράκου περιστροφή, of the game ὀστρακίνδα (which see), [Refs 5th c.BC+]; so ὀστράκου μεταπεσόντος 'if heads become tails', [Refs]
__4 earthenware castanet, ἡ τοῖς ὀ. κροτοῦσα [Μοῦσα], of the poetry of Euripides, [Refs 5th c.BC+]
__II the hard shell of snails, mussels, cuttle-fishes, tortoises, etc., [Refs 5th c.BC+]: hence, tortoise-shell or mother-of-pearl, κλιντῆρες ὀστράκοις.. ἐνδεδεμένοι probable reading in [Refs 1st c.AD+]; the shell at the base of the constellation Lyra, [Refs 1st c.BC+]
__II.2 egg-shell, ἀπτῆνα.., ἄρτι γυμνὸν ὀστράκων [Refs 4th c.BC+]

_{LSJ Scripture Refs: LXX.Ps.21.16*}