Source : Webster's Revised Unabridged Dictionary (1913)

Crud \Crud\ (kr?d), n.
   See {Curd}. [Obs.]

Source : WordNet®

crud
     n 1: heavy wet snow that is unsuitable for skiing
     2: any substance considered disgustingly foul or unpleasant
        [syn: {filth}, {skank}]
     3: an ill-defined bodily ailment; "he said he had the crud and
        needed a doctor"