The Greek word for heart is
καρδιά

Translations for heart and their definitions

καρδιά	©
1. n-f. (anatomy) heart

ψυχή
1. n-f. (religion, folklore, also figurative) soul, spirit (essence of a person (or place or thing figuratively) usually thought to consist of one's thoughts and personality)
Ο Θεός να αναπαύσει την ψυχή της. - God rest her soul.
Το σώμα είναι η κιβωτός της ψυχής. - The body is the vessel of the soul.
Στον δρόμο δεν υπήρχε ψυχή τέτοια ώρα. - There wasn't a soul to be seen on the road at that hour.
η ψυχή της Ελλάδας - the soul of Greece
2. n-f. (figuratively) courage, bravery, valour (quality of a confident character not to be afraid or intimidated easily)
3. n-f. (entomology) butterfly
4. n-f. (music) sound post (of a string instrument, e.g. the violin)