The Collaborative International Dictionary of English v.0.48:

curvaceous \curvaceous\ adj.
   having a pronounced womanly shape; having a slender waist
   with prominent breasts and hips. [chiefly dialect]

   Syn: bosomy, buxom, full-bosomed, sonsie, sonsy, voluptuous.
        [WordNet 1.5 +PJC] Curval

WordNet (r) 3.0 (2006):

curvaceous
    adj 1: (of a woman's body) having a large bosom and pleasing
           curves; "Hollywood seems full of curvaceous blondes"; "a
           curvy young woman in a tight dress" [syn: bosomy,
           busty, buxom, curvaceous, curvy, full-bosomed,
           sonsie, sonsy, stacked, voluptuous, well-
           endowed]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "curvaceous":
   Junoesque, agreeable, amply endowed, attractive, becoming, bent,
   billowing, billowy, bonny, braw, built, built for comfort, buxom,
   callipygian, callipygous, charming, comely, curvate, curvated,
   curve, curved, curvesome, curviform, curvilineal, curvilinear,
   curving, curvy, fair, geosynclinal, goddess-like, good-looking,
   goodly, incurvate, incurvated, incurved, incurving, labyrinthine,
   likely, lovely to behold, mazy, meandering, personable, pleasing,
   pneumatic, presentable, recurvate, recurvated, recurved, recurving,
   rounded, serpentine, shapely, sightly, sinuous, slender, stacked,
   statuesque, tortuous, undulant, wavy, well-built, well-developed,
   well-favored, well-formed, well-made, well-proportioned,
   well-shaped, well-stacked