:  a structure in an invertebrate animal functionally analogous to the vertebrate heart

:  breast, bosom placed his hand on his heart

:  something resembling a heart in shape; specifically :  a stylized representation of a heart a card decorated with hearts and flowers

:  personality, disposition a cold heart

: obsolete :  intellect

:  the emotional or moral nature as distinguished from the intellectual nature: such as

:  generous disposition :  compassion a leader with heart

:  love, affection won her heart

:  courage or enthusiasm especially when maintained during a difficult situation never lost heart

:  one’s innermost character, feelings, or inclinations knew it in his heart a man after my own heart

:  the central or innermost part :  center a cabin in the heart of the forest

:  the essential or most vital part of something the heart of the city get to the heart of the matter

AT HART

:  in essence :  basically, essentially a romantic at heart

BY HART

:  by rote or from memory knows the poem by heart

TO HART

:  with deep concern took the criticism to heart

ORIGIN AND ETYMOLOGY OF HART

Middle English hert, from Old English heort; akin to Latin cervus hart, Greek keras horn — more at horn / Middle English hert, from Old English heorte; akin to Old High German herza heart, Latin cord-, cor, Greek kardia