Proto-Mongolian: *bul-
Meaning: swelling, lump
Russian meaning: опухоль, выпуклость
Written Mongolian: buluw, bulduruw (L 134, 136: bulu, bulduru)
Middle Mongolian: bulu 'hob' (HY 18)
Khalkha: bulū, buldrū
Buriat: bula, bulū; bulxaj- 'be convex'
Kalmuck: bulǝ
Dagur: bol, bolo 'bolster' (Тод. Даг. 127)
Comments: KW 59. An expressive root with numerous derivatives (bul-t-, bul-č-, bül-t- etc.); there also exist variants with -a- (bal-t-, bal-č- etc.). Most of these forms can also be found borrowed in modern Turkic and Tungus languages (see, e.g., Doerfer MT 73). Bur. > Russ. Siber. buldurun 'кочка' (Аникин 140).
