Proto-Korean: *mɨ̀i'ìm
Meaning: gums
Russian meaning: десны
Middle Korean: nì-s-mɨ̀i'ìm, ní-s-mɨ̀'jòm, ni-s-mɨ'ɨm, ni-s-mɨi'jom (ni- 'tooth'
Comments: Nam 127. The modern form it-mom is a result of reinterpreting the compound as 'tooth's flesh' (mom).