资料来源 : pyDict

赤榆树脂; 乌敏素; 棕腐酸

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Ulmin \Ul"min\, n. [L. ulmus an elm: cf. F. ulmine.] (Chem.)
   A brown amorphous substance found in decaying vegetation. Cf.
   {Humin}. [Formerly written {ulmine}.]