Comments:Whitman 1985, 153-154, 210 (Kor.-Jpn.). Jpn. *pia < *pi̯àr(i)-ga (cf. TM *par-ga-) or < *pi̯àr(i)-ŋa (cf. PT *biar-ŋa-k). For the reflex *-a- in TM see notes to *pi̯ắlagV. The original meaning is 'finger, finger width', whence 'bedding, layer ("one finger thick")'. Such a combination of meanings is still clearly seen in TM (without which the Turkic and Jpn.-Kor. forms would be hardly comparable).
