heartrot

noun

: any of several rots involving the central part of a plant or plant organ: such as

a

: disintegration of the heartwood of a tree (as by fungi of the genus Fomes)

b

: a disease of beets and rutabagas caused by a fungus (Mycosphaerella tabifica) that brings about decay of the heart and blighting of the leaves

c

: a rot of sugar beets caused by boron deficiency

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now