"mottles" in the noun sense
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"
"mottles" in the verb sense
1. mottle, streak, blotch
mark with spots or blotches of different color or shades of color as if stained
2. mottle, dapple, cloud
colour with streaks or blotches of different shades
Source: WordNet® (An amazing lexical database of English)
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