Definition of "heartstrings" in English

noun

1. The tendons or other structures resembling cords once thought to be attached to, or to brace, the heart; especially the aorta, pulmonary artery, and other large arteries connected to them; also, the diaphragm.

2. Synonym of chordae tendineae (“the cord-like tendons that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart”).

3. The source of one's deepest emotions or inner feelings, especially compassion or love.

   • The sad eyes of the orphan tugged at my heartstrings.

4. The essential or vital part of something; the core, the essence, the heart.