Source : Webster's Revised Unabridged Dictionary (1913)

Cellar \Cel"lar\, n. [OE. celer, OF. celier, F. celier, fr. L.
   cellarium a receptacle for food, pantry, fr. cella storeroom.
   See {Cell}.]
   A room or rooms under a building, and usually below the
   surface of the ground, where provisions and other stores are
   kept.

Source : WordNet®

cellar
     n 1: the lowermost portion of a structure partly or wholly below
          ground level; often used for storage [syn: {basement}]
     2: an excavation where root vegetables are stored [syn: {root
        cellar}]
     3: storage space where wines are stored [syn: {wine cellar}]