n. A person who is or tries to be excessively proper, especially one who is easily offended by matters of a sexual nature.
the GNU version of the Collaborative International Dictionary of English
n. A woman of affected modesty, reserve, or coyness; one who is overscrupulous or sensitive; one who affects extraordinary prudence in conduct and speech.
The Century Dictionary and Cyclopedia
n. A woman who affects rigid correctness in conduct and thought; one who exhibits extreme propriety or coyness in behavior: occasionally applied also to a man.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person excessively concerned about propriety and decorum
Word Usage
"I read once that a prude is a good woman in the worst sense of the word."