Occlusive means Impenetrable. Usually refers to an occlusive shield or film that is spread onto the skin to slow or prevent moisture evaporation. This shield or film is usually made up of materials, such as oils and waxes that cannot be penetrated by water.

Impenetrable. A shield or film spread on the skin to slow or prevent moisture loss. Usually an oil or wax.

tending to occlude

Dressing that is impervious to air or water

a covering (eg wound dressing) to protect and/or heal a moist wound.

a consonant produced by stopping the flow of air at some point and suddenly releasing it; "his stop consonants are too aspirated"