n. & adj.
n. (pl. -ies) 1 a man unduly devoted to style, smartness, and fashion in dress and appearance. 2 colloq. an excellent thing.
adj. (dandier, dandiest) esp. US colloq. very good of its kind; splendid, first-rate. dandy-brush a brush for grooming a horse. dandy roll (or roller) a device for solidifying, and impressing a watermark in, paper during manufacture. dandyish adj. dandyism n.
[ 18th c.: perh. orig. = Andrew, in Jack-a-dandy ]