Webster's English Dictionary

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checker

1. check.er \'chek-*r\ n [ME cheker, fr. OF eschequier, fr. eschec] 
   [back-formation fr. checkers] archaic  1: CHESSBOARD  2: a square or spot 
   resembling checkerboard markings  3a: either of two Old World service trees 
   (Sorbus domestica and S)X. torminalis) 3b: the fruit of a checker  4: a man 
   in checkers 
2. checker \'chek-(*-)rin\ vt or check.er.ing 1a: to variegate with 
   different colors or shades  1b: to vary with contrasting elements or 
   situations  2: to mark into squares 
3. checker n : one that checks