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Webster 1913 Edition

Verb.

[

imp. & p. p.

Mottled

;

p. pr. & vb. n.

Mottling

[From

To mark with spots of different color, or shades of color, as if stained; to spot; to maculate.

Noun.

A mottled appearance.

mottle ‎(third-person singular simple present mottles, present participle mottling, simple past and past participle mottled)

To mark with spots of different color, or shades of color, as if stained; to spot; to maculate.

mottle ‎(plural mottles)

a distinguishing blotch of color
mottled coloration or pattern
The most common symptom is a mild mottle on the youngest leaves of infected plants.