一毫 yīháo a tiny bit Origin Definitions Defs Strokes Stroke Words Sentences Sents 一丝一毫 yīsīyīháo a tiny bit (idiom) a tiny bit; an iota; a trace; extremely minute一分一毫 yīfēnyīháo a tiny bit (idiom) a very small amount; the slightest bit; a tiny fraction