The Avestan word zǝrǝd-
Word zǝrǝd-
Meaning heart
See also Homeric Greek: καρδία ‘heart’
Proto-Indo-European: *k̂erd- (nom. k̂ēr, acc. k̂érd-m̥ gen. k̂r̥d-ós) ‘heart’
Armenian: sirt ‘heart’
Old Norse: hjarta ‘heart’
Hittite: ke-er ‘heart, center, core’
Hittite: kar-di- ‘heart, core’
C. Luwian: za-ar-ta ‘heart’
Proto-Anatolian: *ḱrdios ‘heart, center’
Palaic: ka-a-ar-ti ‘heart’

Other words that might be of interest
zānu- ‘jaw’, čarǝman- ‘skin’, sarah- ‘head’, gava ‘hand’, hizū ‘tongue’, staman ‘mouth’, bruuat̰ ‘eyebrow’, ast- ‘bone’, tanū- ‘body’, bāzu ‘arm, leg’, nāfa- ‘navel’, zānu- ‘knee’, xvafəna- ‘sleep’, pad- ‘foot’