Proto-IE: *k'erd-
Meaning: heart; core, middle
Hittite: ker / kard- n. 'Herz', Pal. karti, Lyk. B kride-si, A kerɵɵi (Tischler 556 ff)
Old Indian: hr̥d n., gen. hr̥dáḥ `heart'
Avestan: zǝrǝdā 'Herz'
Armenian: sirt, instr. srtiv `Herz'
Old Greek: kardíǟ, ep. kradíā f. `Herz; Seele, Geist; der obere Magenmund; Kernholz'+ ep. kǟ̂r, Pind., B., Trag. kéar, dat. kǟ̂ri, adv. kǟróthi n. `Herz'
Latin: cor, gen. cordis n. `Herz'
Celtic: OIr cride n., Ir croidue `Herz'; Cymr craidd `Herz, Mittelpunkt',Bret kreiz `Mitte'
Russ. meaning: сердце; сердцевина, середина
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