LSJ
of ten metrical units; Subst. -μετρον (sc. κῶλον), τό, decameter, Sch. Ar. Eq. 496, etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
zehnfüßig, Vers, Schol. Ar. Eq. 496.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)