ἡμίφωνος

A. half-pronounced, λέξις Aristaenet. 1.10.

2. Subst. ἡμίφωνον,τό, a semi-vowel, as ρ ς, Arist. Po. 1456b27, Phld. Po. 2.16, D.H. Comp. 14, D.T. 631.16, etc.

II. half able to speak, Gal. UP 6.3; half-vocal, of certain signs of the Zodiac, Cat.Cod.Astr. 1.166, Vett.Val. 5.24:—hence ἡμι‐φωνία, ἡ, Steph. in Hp. 1.184D.