Comments:Whitman 1985, 129, 243 (Kor.-Jpn.). The root presents considerable difficulties, and the reconstruction is by no means certain. Phonetically: in PT one should expect rather *jūŕ; the Jpn.-Kor. tone does not correspond to PT length; Kor. *j- is quite exceptional (a better match for Kor. would be perhaps Mong. *je(r)-sün 'nine', *jeri-n 'ninety' (Ozawa 32-33 compares Mong. with Jpn., but initial *d- in Jpn. is an unsurmountable obstacle ); in Kor. cf. also jǝ̀rǝ́h 'a big quantity, number'). Criticism see in TMN 4, 222. Still the Manchu-Jpn. match seems plausible, and some irregularities could be explained by contaminations or tabooistic reasons.