'Diphthongal' definitions:

Definition of 'Diphthongal'

From: GCIDE
  • Diphthongal \Diph*thon"gal\ (?; 115), a. Relating or belonging to a diphthong; having the nature of a diphthong. -- {Diph*thon"gal*ly}, adv. [1913 Webster]