ostracias

εὐλογητὸς εἶ, Χριστὲ ὁ Θεὸς ἡμῶν → blessed are You, o Christ Our God

Latin > English (Lewis & Short)

ostrăcĭas: ae, m., and ostrăcītis, ĭdis, f., = οστρακίας, ὀστρακῖτις,
I a semigem, prob. hornstone or chalcedony, Plin. 37, 10, 65, § 177.