From The Collaborative International Dictionary of English v.0.48:

Occlude \Oc*clude"\, v. t. [L. occludere, occlusum; ob (see
   Ob-) + claudere to shut.]
   1. To shut up; to close. --Sir T. Browne.
      [1913 Webster]

   2. (Chem.) To take in and retain; to absorb; -- said
      especially with respect to gases; as, iron, platinum, and
      palladium occlude large volumes of hydrogen.
      [1913 Webster]
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