Pronunciation: (blak' spot' for 1; blak' spot" for 2),[key] 1. Plant Pathol.a disease of plants, characterized by black spots on the fruit and foliage, twig lesions, defoliation, and rotting, caused by any of several fungi, as Diplocarpon rosae, or bacteria.
2. Brit. a. a hazardous place in a road where accidents frequently occur.
b. a dangerous area or place. Also,black'spot'.