Definition of black heart in US English:

black heart

noun

  • 1Any of several cultivated varieties of sweet cherry producing dark-coloured fruit.

  • 2Agriculture and Horticulture. Any of various plant diseases in which blackening of inner areas of plant tissue takes place; specifically a disease of potatoes characterized by a blackening at the centre of stored and growing tubers, caused by oxygen deprivation such as may result from temperature extremes, waterlogging, or poor ventilation.

  • 3Metallurgy. A type of malleable cast iron containing nodules of graphite in a ferrite matrix. Contrasted with white heart.

Origin

Mid 17th century; earliest use found in John Evelyn (1620–1706), diarist and writer. From black + heart.

Pronunciation

black heart

/ˈblak ˌhɑːt/