Etymology
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mottle (n.)

"a pattern or arrangement of marks or blotches of different colors or shades," 1670s, probably a back-formation from motley.

mottle (v.)

"to mark or cover with spots or blotches of different colors or shades," 1670s; see mottle (n.). Related: Mottled; mottling.

updated on February 27, 2019

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Definitions of mottle from WordNet
1
mottle (v.)
mark with spots or blotches of different color or shades of color as if stained;
Synonyms: streak / blotch
mottle (v.)
colour with streaks or blotches of different shades;
Synonyms: dapple / cloud
2
mottle (n.)
an irregular arrangement of patches of color;
it was not dull grey as distance had suggested, but a mottle of khaki and black and olive-green
From wordnet.princeton.edu, not affiliated with etymonline.