The Collaborative International Dictionary of English v.0.48:

Cervix \Cer"vix\, n.; pl. E. Cervixes, L. Cervices. [L.]
   (Anat.)
   The neck; also, the necklike portion of any part, as of the
   womb. See Illust. of Bird.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cervix
    n 1: the part of an organism (human or animal) that connects the
         head to the rest of the body; "he admired her long graceful
         neck"; "the horse won by a neck" [syn: neck, cervix]
    2: necklike opening to the uterus [syn: cervix, uterine
       cervix, cervix uteri]

Moby Thesaurus II by Grady Ward, 1.0:

178 Moby Thesaurus words for "cervix":
   abbreviation, advocate, alpenstock, ankle, arm, articulation,
   astriction, astringency, athletic supporter, back, backbone,
   backing, bag, ballocks, balls, bandeau, basket, beard, bearer,
   bottleneck, boundary, bra, brace, bracer, bracket, brassiere,
   breasts, butt, buttress, cane, carrier, circumscription, clinch,
   clitoris, closure, coarctation, cod, cods, compactedness,
   compaction, compression, compressure, concentration, condensation,
   connecting link, connecting rod, connection, consolidation,
   constriction, constringency, contraction, contracture, corset,
   coupling, crook, crutch, cullions, curtailment, decrease,
   diminuendo, dovetail, elbow, embrace, family jewels, female organs,
   foundation garment, fulcrum, genitalia, genitals, girdle,
   gliding joint, gonads, guy, guywire, hinge, hinged joint, hip,
   hourglass, hourglass figure, interface, isthmus, jock, jockstrap,
   join, joining, joint, juncture, knee, knitting, knuckle, labia,
   labia majora, labia minora, lingam, link, lips, mainstay,
   maintainer, male organs, mast, meat, miter, mortise, narrow place,
   narrowing, neck, nuts, nymphae, ovary, penis, phallus, pivot,
   pivot joint, private parts, privates, privy parts, prop,
   pubic hair, puckering, pudenda, pursing, rabbet, reduction,
   reinforce, reinforcement, reinforcer, reproductive organs, rest,
   resting place, rigging, rocks, scarf, scrotum, seam,
   secondary sex characteristic, sex organs, shortening, shoulder,
   shroud, solidification, spermary, spine, sprit, staff,
   standing rigging, stave, stay, stick, stiffener, stitch,
   stranglement, strangulation, strengthener, striction, stricture,
   support, supporter, sustainer, suture, symphysis, systole, testes,
   testicles, tie rod, toggle, toggle joint, union, upholder, uterus,
   vagina, vulva, walking stick, wasp waist, weld, womb, wrinkling,
   wrist, yoni