The Collaborative International Dictionary of English v.0.48:

Parturient \Par*tu"ri*ent\, a. [L. parturiens, p. pr. of
   parturire to desire to bring forth, fr. parere, partum, to
   bring forth. See Parent.]
   Bringing forth, or about to bring forth, young; fruitful.
   --Jer. Taylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

parturient
    adj 1: of or relating to or giving birth; "parturient pangs";
           "the parturient uterus"
    2: giving birth; "a parturient heifer"

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "parturient":
   abecedarian, aboriginal, antenatal, anticipating, autochthonous,
   beginning, big, big with child, big-laden, breeding, budding,
   carrying, carrying a fetus, creative, elemental, elementary,
   embryonic, expectant, expecting, fetal, formative, foundational,
   fundamental, gestating, gestatory, gone, gravid, great, heavy,
   heavy with child, in embryo, in its infancy, in the bud, inaugural,
   inceptive, inchoate, inchoative, incipient, incunabular, infant,
   infantile, initial, initiative, initiatory, introductory,
   inventive, knocked up, nascent, natal, original, postnatal,
   preggers, pregnant, prenatal, primal, primary, prime, primeval,
   primitive, primogenial, procreative, rudimental, rudimentary,
   superfetate, superimpregnated, teeming, ur, with child