diphthongic, a.
(dɪfˈθɒŋgɪk)
[f. Gr. δίϕθογγ-ον diphthong n. + -ic.]
= diphthongal.
| 1880 Sweet in President's Addr. Philol. Soc. 41 The treatment of the diphthongic vowel. 1886 ― in Academy 24 Apr. 295/3 The older true diphthongic pronunciation of [Latin] ae and oe nearly as in English by and boy. |