龈颚音 yín'èyīn prepalatal sound Origin Definitions Defs Strokes Stroke Words Sentences Sents 龈 齦 yín noun gums (bound form) gums; the flesh around the base of the teeth颚 顎 è palate the roof of the mouth in vertebrates, consisting of the hard palate and soft palate音 yīn noun syllable a unit of sound; a phone or syllable