chlamydia (n.) Look up chlamydia at Dictionary.com
type of genital infection, 1984, from the name of the bacteria that causes it (1945), which is formed from Latinized comb. form of Greek khlamys (genitive khlamydos) "short mantle, upper garment for men, military cloak," which is of unknown origin, + abstract noun ending -ia. Said to be so called due to its ability to "cloak" the nuclei of infected cells.