n condom. In the U.K., Durex is a large (possibly the largest, I’m not sure) manufacturer of condoms, and the brand name once slipped into the language (no pun intended). The term is actually becoming less common these days. A very similar thing happened in the U.S. with “Trojan.” As an aside, Durex, to an Australian, is sticky-tape (a.k.a. Scotch tape). I don’t know if they use it as a contraceptive, and I don’t wish to think about it any further.