DIPHTHONG

noun Etymology: Middle English diptonge, from Middle French diptongue, from Late Latin dipthongus, from Greek ~os, from di- + phthongos voice, sound Date: 15th century a gliding monosyllabic speech sound (as the vowel combination at the end of toy ) that starts at or near the articulatory position for one vowel and moves to or toward the position of another, digraph , the ligature æ or œ, ~al adjective