base·ment /ˈbesmənt/
  地下室,地窖;建築物的基部
  Base·ment n.  Arch. The outer wall of the ground story of a building, or of a part of that story, when treated as a distinct substructure.  (See Base, n., 3 (a).)  Hence: The rooms of a ground floor, collectively.
  Basement membrane Anat., a delicate membrane composed of a single layer of flat cells, forming the substratum upon which, in many organs, the epithelioid cells are disposed.
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  basement
       n 1: the lowermost portion of a structure partly or wholly below
            ground level; often used for storage [syn: cellar]
       2: the ground floor facade or interior in Renaissance
          architecture