Source : Webster's Revised Unabridged Dictionary (1913)

Caber \Ca"ber\, n. [Gael. cabar.]
   A pole or beam, esp. one used in Gaelic games for tossing as
   a trial of strength.

Caber \Ca"ber\ (k[=a]"b[~e]r), n. [Gael]
   A pole or beam used in Scottish games for tossing as a trial
   of strength.

Source : WordNet®

caber
     n : a heavy wooden pole (such as the trunk of a young fir)
         tossed as a test of strength (in the Highlands of
         northern Scotland)