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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Humin  \Hu"min\,  n.  [L.  humus  the  earth,  ground.]  (Chem.) 
  A  bitter,  brownish  yellow,  amorphous  substance,  extracted 
  from  vegetable  mold,  and  also  produced  by  the  action  of  acids 
  on  certain  sugars  and  carbohydrates;  --  called  also  {humic 
  acid},  {ulmin},  {gein},  {ulmic}  or  {geic  acid},  etc