Lewis & Short

Atthis (better than Attis), ĭdis, adj. f., = Ἀτθίς.

  1. I. Attic or Athenian: matres, Mart. 11, 53: lingua, App. M. 1, praef. Oud.
    Hence,
  2. II. Subst.
    1. A. An Athenian woman, Sen. Hippol. 107.
      Esp., Philomela; and, since she was changed to a nightingale, meton. for a nightingale, Mart. 1, 54, 9. Also Procne, the sister of Philomela; acc. to the fable (cf. Sen. Herc. Oet. 200), changed into a swallow; hence, meton. for a swallow, Mart. 5, 67.
    2. B. A female friend of Sappho: Non oculis grata est Atthis, Ov. H. 15, 18 Merk. ubi v. Loers.
    3. C. A name for Attica: Atthide temptantur gressus, Lucr. 6, 1116; Sid. Carm. 5, 44; cf. Mel. 2, 3, 4; 2, 7, 10.