Pronunciation: (bloch),[key] —n. 1. a large, irregular spot or blot.
2. Plant Pathol. a. a diseased, discolored spot or area on a plant.
b. a disease so characterized, usually accompanied by cankers and lesions.
3. a skin eruption; blemish.
—v.t. to mark with blotches; blot, spot, or blur: The floor of the forest was blotched with cool, dark moss.
—adj. Textiles.of or pertaining to blotch printing, or to the colored ground produced by this process.