扣眼儿 kòuyǎnr buttonhole Definitions Defs Origin Strokes Stroke Words Sentences Sents 扣眼 釦眼 kòuyǎn buttonhole a small hole or loop through which a button is passed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.