Impossible to permeate. / Not allowing passage, especially of liquids; waterproof.

(informal) Once a person of another race has a sexual relationship with a black person, they will not return to having sexual relationships with members of the former race.

Third-person singular simple present indicative form of decrypt

(mineralogy) A trigonal-hexagonal scalenohedral colorless mineral containing arsenic, calcium, hydrogen, oxygen, phosphorus, and sulfur.