Webster's English Dictionary

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crimson

1. crim.son \'krim-z*n\ n [ME crimisin, fr. OSp cremesi'n, fr. Ar qirmizi-, 
   fr. (Xqirmiz kermes : any of several deep purplish reds 
2. crimson aj : of the color crimson 
3. crimson vt : to make crimson to become crimson