Heartrot, also known as heartwood decay, is a fungi disease that affects the core of trees, causing the wood to decay and rot. There are several synonyms for the word, including "heart rot," "trunk rot," and "stem decay." Other terms used to describe wood rot include "canker," "dry rot," and "wet rot." Heartrot is a serious problem for trees, as it can weaken the structural integrity of the trunk, making them more susceptible to damage from storms or other environmental factors. It is important for tree owners to be aware of the signs of heartrot and take appropriate measures to prevent or treat the disease to ensure the longevity and health of their trees.