Dictionary:

mottled

  (mŏt'ld)

Spotted or blotched with different shades or colors.

Definition: speckled
Antonyms: plain, unflecked

Wavy grain combines with spiral, interlocked grain to produce a wrinkled, botchy figure known as mottle. The mottled figure may be scattered randomly (broken mottle), or appear as a regular checkerboard pattern (block mottle). Members of the mahogany family, koa, sapele, bubinga and African satinwood, most commonly exhibit mottled figure.

The adjective has one meaning:

Meaning #1: having spots or patches of color
  Synonym: dappled