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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]