牙缝儿 yáfèngr gap between teeth Origin Definitions Defs Strokes Stroke Words Sentences Sents 牙缝 牙縫 yáfèng noun gap between teeth The gap, slit, or space between adjacent teeth or between the upper and lower teeth儿 兒 r particleaffix [erhua suffix] A suffix attached to a word to form a retroflex ending, often indicating a small size, a sense of familiarity, or turning a word into a noun.