black knot

1. 1.

   disease of plum and cherry trees characterized by black excrescences on the branches

   Broaderplant disease

Questions about black knot

What does black knot mean?

black knot means "disease of plum and cherry trees characterized by black excrescences on the branches".

Is black knot a common word?

black knot is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.