The Collaborative International Dictionary of English v.0.48:

Whore \Whore\ (h[=o]r), n. [OE. hore, AS. h[=o]re; akin to D.
   hoer, hoere, G. hure, OHG. huora, huorra, Icel. h[=o]ra, Dan.
   hore, Sw. hora, Goth. h[=o]rs an adulterer, AS. h[=o]r
   adultery, OHG. huor, and probably to L. carus dear. Cf.
   Charity.]
   A woman who practices unlawful sexual commerce with men,
   especially one who prostitutes her body for hire; a
   prostitute; a harlot. --Wyclif.
   [1913 Webster]

   Syn: Harlot; courtesan; prostitute; strumpet.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Whore \Whore\, v. i. [imp. & p. p. Whored; p. pr. & vb. n.
   Whoring.] [Cf. Icel. h?ra. See Whore, n.]
   [1913 Webster]
   1. To have unlawful sexual intercourse; to practice lewdness.
      [1913 Webster]

   2. (Script.) To worship false and impure gods.
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The Collaborative International Dictionary of English v.0.48:

Whore \Whore\, v. t.
   To corrupt by lewd intercourse; to make a whore of; to
   debauch. [R.] --Congreve.
   [1913 Webster]

WordNet (r) 3.0 (2006):

whore
    n 1: a woman who engages in sexual intercourse for money [syn:
         prostitute, cocotte, whore, harlot, bawd, tart,
         cyprian, fancy woman, working girl, sporting lady,
         lady of pleasure, woman of the street]
    v 1: work as a prostitute
    2: have unlawful sex with a whore
    3: compromise oneself for money or other gains; "She whored
       herself to Hollywood"