The Collaborative International Dictionary of English v.0.48:

Checker \Check"er\, n. [OF. eschequier. See Checker, v. t.]
   1. A piece in the game of draughts or checkers.
      [1913 Webster]

   2. A pattern in checks; a single check.
      [1913 Webster]

   3. Checkerwork.
      [1913 Webster]

   Note: This word is also written chequer.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chequer \Cheq"uer\ (ch[e^]k"[~e]r), n. & v.
   Same as Checker.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chequer
    n 1: one of the flat round pieces used in playing the game of
         checkers [syn: checker, chequer]
    v 1: mark into squares or draw squares on; draw crossed lines on
         [syn: check, checker, chequer]
    2: variegate with different colors, shades, or patterns [syn:
       checker, chequer]