Embryonic

embryonic
    adj 1: of an organism prior to birth or hatching; "in the
           embryonic stage"; "embryologic development" [syn:
           {embryonic}, {embryologic}, {embryonal}]
    2: in an early stage of development; "the embryonic government
       staffed by survivors of the massacre"; "an embryonic nation,
       not yet self-governing" [syn: {embryonic}, {embryotic}]
    

Embryonic \Em`bry*on"ic\, a. (Biol.)
   Of or pertaining to an embryo; embryonal; rudimentary.
   [1913 Webster]

   {Embryonic sac} or {Embryonic vesicle} (Bot.), the vesicle
      within which the embryo is developed in the ovule; --
      sometimes called also {amnios sac}, and {embryonal sac}.
      [1913 Webster]
    

142 Moby Thesaurus words for "embryonic":
      abecedarian, aboriginal, antenatal, arrested, atomic,
      autochthonous, backward, basal, basic, beginning, budding, callow,
      central, coarse, corpuscular, creative, crucial, crude, defective,
      deficient, elemental, elementary, evanescent, failing, fetal,
      formative, foundational, fundamental, generative, genetic,
      germinal, germinant, germinational, germinative, germiparous,
      gestatory, granular, hypoplastic, immature, impalpable,
      imperceptible, imponderable, in arrear, in arrears, in default,
      in embryo, in its infancy, in ovo, in short supply, in the bud,
      in the rough, inadequate, inappreciable, inaugural, inceptive,
      inchoate, inchoative, incipient, incomplete, incunabular,
      indiscernible, infant, infantile, infinitesimal, initial,
      initiative, initiatory, intangible, introductory, inventive,
      invisible, lacking, larval, microcosmic, microscopic, missing,
      molecular, nascent, natal, needing, original, oversimple, part,
      partial, parturient, patchy, postnatal, pregnant, prenatal, primal,
      primary, prime, primeval, primitive, primogenial, primordial,
      pristine, procreative, protogenic, radical, reductionistic,
      reductive, rough, roughcast, roughhewn, rude, rudimental,
      rudimentary, scant, scanty, scrappy, seminal, short, shy,
      simplistic, sketchy, stunted, subatomic, tenuous, thin,
      ultramicroscopic, unblown, uncultivated, uncultured, uncut,
      underdeveloped, undeveloped, unfashioned, unfinished, unformed,
      unhewn, unlabored, unlicked, unpolished, unprocessed, unrefined,
      unseeable, untreated, unworked, unwrought, ur, wanting