How to sign: the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions pump blood through the body
"he stood still, his heart thumping wildly";
Categories: internal organ, viscus
Within this category: athlete's heart, biauriculate heart
How to sign: a small portable timepiece
Similiar / Same: watch
Categories: timekeeper, timepiece
Within this category: analog watch, digital watch, hunter, pendulum watch, pocket watch, stem-winder, wristwatch