Occlusion /(?)/

Oc·clu·sion

Occlusion

n.
  1. The act of occluding, or the state of being occluded.
    Constriction and occlusion of the orifice.
  2. The transient approximation of the edges of a natural opening; imperforation. (Med.)

Phrases & Compounds
Occlusion of gases
the phenomenon of absorbing gases, as exhibited by platinum, palladium, iron, or charcoal; thus, palladium absorbs, or occludes, nearly a thousand times its own volume of hydrogen, and in this case a chemical compound seems to be formed.