What is "r-word"

alt. 1 (context euphemistic English) The word ''retard'' regarded as a vulgar or taboo word. 2 (context euphemistic English) The word ''redskin'' or ''redskins'' (including ''http://en.wikipedia.org/wiki/Washington%20Redskins%20name%20controversy'' as a team name) regarded as a vulgar or taboo word. 3 (context euphemistic English) The word ''rape'' regarded as a vulgar or taboo word. 4 (context humorous English) Any word beginning with r that is not normally taboo but is considered (often humorously) to be so in the given context. n. 1 (context euphemistic English) The word ''retard'' regarded as a vulgar or taboo word. 2 (context euphemistic English) The word ''redskin'' or ''redskins'' (including ''http://en.wikipedia.org/wiki/Washington%20Redskins%20name%20controversy'' as a team name) regarded as a vulgar or taboo word. 3 (context euphemistic English) The word ''rape'' regarded as a vulgar or taboo word. 4 (context humorous English) Any word beginning with r that is not normally taboo but is considered (often humorously) to be so in the given context.