Yes, that's how it's mostly used today. But here are some dictionary definitions.
OED (I've cut the examples)
> prude, a. and n.
> A. adj. That maintains or affects extreme propriety of speech and behaviour, especially in regard to the relations of the sexes; excessively modest, demure, or prim; prudish: usually applied adversely. Now rare.
[...]
> prude, a. and n.
> (pru?d)[a. mod.F. prude adj. and n., said of a woman in same sense as the Eng. (Molière in Littré), in OF. prude, prode, preude, in a laudatory sense, good, virtuous, modest, respectable; either a back-formation from prudefemme (cf. prudhomme) or a later fem. form of prod, pro, pru: see preux, prow a.]
>prude, a. and n.
> B. n. A woman who maintains or affects excessive modesty or propriety in conduct or speech; one who is of extreme propriety: usually applied adversely with implication of affectation.
[...]
> prude, a. and n.
> Hence 'prudelike a., of the nature of, or characteristic of, a prude; 'prudely adv., in the manner of a prude.
[...]
> prude, v.
> intr. To conduct oneself in the manner of a prude; to act prudishly. Hence 'pruding vbl. n.
Websters Revised (1913):
> Prude \Prude\, n. [F., prudish, originally, discreet, modest;
> shortened from OF. prudefeme, preudefeme, a discreet or excellent woman; OF. preu, prou, excellent, brave + de of + fete woman. See {Prow}, a., {Prowess}.] A woman of affected modesty, reserve, or coyness; one who is overscrupulous or sensitive; one who affects extraordinary prudence in conduct and speech.
Chambers:
> prude /prood/
> noun
> 1. A person of priggish or affected modesty
> 2. Someone who has or pretends to have extreme propriety
OED (I've cut the examples)
> prude, a. and n.
> A. adj. That maintains or affects extreme propriety of speech and behaviour, especially in regard to the relations of the sexes; excessively modest, demure, or prim; prudish: usually applied adversely. Now rare.
[...]
> prude, a. and n.
> (pru?d)[a. mod.F. prude adj. and n., said of a woman in same sense as the Eng. (Molière in Littré), in OF. prude, prode, preude, in a laudatory sense, good, virtuous, modest, respectable; either a back-formation from prudefemme (cf. prudhomme) or a later fem. form of prod, pro, pru: see preux, prow a.]
>prude, a. and n.
> B. n. A woman who maintains or affects excessive modesty or propriety in conduct or speech; one who is of extreme propriety: usually applied adversely with implication of affectation.
[...]
> prude, a. and n.
> Hence 'prudelike a., of the nature of, or characteristic of, a prude; 'prudely adv., in the manner of a prude.
[...]
> prude, v.
> intr. To conduct oneself in the manner of a prude; to act prudishly. Hence 'pruding vbl. n.
Websters Revised (1913):
> Prude \Prude\, n. [F., prudish, originally, discreet, modest;
> shortened from OF. prudefeme, preudefeme, a discreet or excellent woman; OF. preu, prou, excellent, brave + de of + fete woman. See {Prow}, a., {Prowess}.] A woman of affected modesty, reserve, or coyness; one who is overscrupulous or sensitive; one who affects extraordinary prudence in conduct and speech.
Chambers:
> prude /prood/
> noun
> 1. A person of priggish or affected modesty
> 2. Someone who has or pretends to have extreme propriety
> adjective ( rare)
> 1. Priggish or affectedly modest
> 2. Claiming extreme propriety
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