a large, irregular spot or blot.

Plant Pathology .

a diseased, discolored spot or area on a plant.

a disease so characterized, usually accompanied by cankers and lesions.

a skin eruption; blemish.

to mark with blotches; blot, spot, or blur

The floor of the forest was blotched with cool, dark moss.

Textiles . of or pertaining to blotch printing, or to the colored ground produced by this process.

noun

blank , clarity , cleanness

noun

acne , blemish , blot , breakout , eruption , mark , mottling , patch , splash , spot , stain , stigma , daub , smirch , smudge , smutch , splotch , blain , bleb , bulla , dab , imperfection , macula , maculation , pustule , smear

verb

bespatter , spatter , splatter , splotch