Lewis & Short

1. Mŏlossus, a, um, adj., = Μολοσσός, of or belonging to the Molossi, Molossian: missi de gente Molossā, Ov. M. 1, 226: canes, famed for their strength, Hor. S. 2, 6, 114: rex, Juv. 12, 108: gladii, id. 14, 162.
Also, subst.: Mŏlossus, i, m.

  1. A. A Molossian (hound): Molossus acer, Verg. G. 3, 405: Molossūm for Molossorum, Lucr. 5, 1063.
  2. B. In prosody: pes, a metrical foot consisting of three long syllables (e. g. Arpinas, evertunt), Quint. 9, 4, 82; Diom. p. 475 P.