keuhko

keu- + -hko, most likely a diminutive derivative of the same root as kevyt, keveä (“light”). For the phonetic development, compare köykäinen (the variant kouhko is found in some eastern dialects); for semantic parallels, compare English lights (“lungs”), Russian лёгкое (ljóxkoje, “lung”), Northern Sami geahpis (“lung”). Displaced tävy.