blackhearts

Noun

blackheart (plural blackhearts)

1. A heart-shaped cherry with a very dark skin.
   • There are cherries enough for all, as when we planted we took into consideration the needs of our feathered neighbors, so the birds do not miss the fruit when on our breakfast table appears a great wooden bowl —you have no idea what an artistic bit the chopping bowl becomes when utilized in this...1914, E.B. Loring, For the comfort of the family, →ISBN, page 89
2. Any of various plant diseases that cause darkening of the central tissue.
   • Blackheart results from inadequate oxygen supply for respiration (asphyxiation) of internal tuber tissue.1981, W. J. Hooker, Compendium of Potato Diseases, →ISBN, page 10
3. A type of malleable cast iron with minimum tensile strength of 350 N/mm².
   • Blackheart malleable cast iron has excellent castability and machinability.2013, V. B. Bhandari, Introduction to Machine Design, →ISBN, page 49
4. A cruel and remorseless person.
   • That blackheart would have thrust you out to wail and gained the time himself, without you there.2007, Jo Walton, The King's Name, →ISBN