In some instances pseudo-membrane is so massed in plugs as to occlude the cavity of the tube, as with obturators.

At the same time it may so compress the main tube as to occlude its calibre and prevent access of food to the stomach.

The presence of old splits is often indicated by a ridge of callous, the result of the cambium's effort to occlude the wound.

When the nitration is completed, screw up the clamps and so occlude the two pieces of pressure tubing.

In finely divided form it has the ability to absorb or occlude gases, especially oxygen and hydrogen.