1706, traditionally named for a British physician during reign of Charles II (a story traceable to 1709), but there is no evidence for that. Also spelled condam, quondam, which suggests it may be from Italian guantone, from guanto "a glove." A word omitted in the original OED (c.1890) and not used openly in the U.S. and not advertised in mass media until November 1986 speech by Surgeon General C. Everett Koop on AIDS prevention. Cf. prophylactic.
condom con·dom (kŏn'dəm)
A flexible sheath, usually made of thin rubber or latex, designed to cover the penis or vagina during sexual intercourse for contraceptive purposes or as a means of preventing sexually transmitted diseases.
A similar device, consisting of a loose-fitting polyurethane sheath closed at one end, that is inserted into the vagina before sexual intercourse.