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Etymology and other terms

The term condom first appears in the early 18th century: early forms include condum (1706 and 1717), condon (1708) and cundum (1744). The word's etymology is unknown. In popular tradition, the invention and naming of the condom came to be attributed to an associate of England's King Charles II, one "Dr. Condom" or "Earl of Condom". There is however no evidence of the existence of such a person, and condoms had been used for over one hundred years before King Charles II acceded to the throne in 1660.

A variety of unproven Latin etymologies have been proposed, including condon (receptacle), condamina (house), and cumdum (scabbard or case). It has also been speculated to be from the Italian word guantone, derived from guanto, meaning glove. William E. Kruck wrote an article in 1981 concluding that, "As for the word 'condom', I need state only that its origin remains completely unknown, and there ends this search for an etymology." Modern dictionaries may also list the etymology as "unknown".

Other terms are also commonly used to describe condoms. In North America condoms are also commonly known as prophylactics, or rubbers. In Britain they may be called French letters or rubber johnnies. Additionally, condoms may be referred to using the manufacturer's name.