Lewis & Short

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

ostrăcītis, ĭdis, f., = ὀστρακῖτις.

  1. I. Hornstone; v. ostracias.
  2. II. A kind of cadmia, Plin. 34, 10, 22, § 103.