The Collaborative International Dictionary of English v.0.48:

Neural \Neu"ral\, a. [Gr. ney^ron nerve.] (Anat. & Zool.)
   relating to the nerves or nervous system; taining to,
   situated in the region of, or on the side with, the neural,
   or cerebro-spinal, axis; -- opposed to hemal. As applied to
   vertebrates, neural is the same as dorsal; as applied to
   invertebrates it is usually the same as ventral. Cf. Hemal.
   [1913 Webster]

   Neural arch (Anat.), the cartilaginous or bony arch on the
      dorsal side of the centrum of the vertebra in a segment of
      the spinal skeleton, usually inclosing a segment of the
      spinal cord.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Posterior \Pos*te"ri*or\ (p[o^]s*t[=e]"r[i^]*[~e]r), a. [L.
   posterior, compar. of posterus coming after, from post after.
   See Post-.]
   1. Later in time; hence, later in the order of proceeding or
      moving; coming after; -- opposed to prior.
      [1913 Webster]

            Hesiod was posterior to Homer.        --Broome.
      [1913 Webster]

   2. Situated behind; hinder; -- opposed to anterior.
      [1913 Webster]

   3. (Anat.) At or toward the caudal extremity; caudal; -- in
      human anatomy often used for dorsal.
      [1913 Webster]

   4. (Bot.) On the side next the axis of inflorescence; -- said
      of an axillary flower. --Gray.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dorsal \Dor"sal\, n. [LL. dorsale, neut. fr. dorsalis. See
   Dorsal, a.] (Fine Arts)
   A hanging, usually of rich stuff, at the back of a throne, or
   of an altar, or in any similar position.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dorsal \Dor"sal\, a. [F. dorsal, LL. dorsalis, fr. L. dorsualis,
   fr. dorsum back; cf. Gr. ?, ?, mountain ridge. Cf. Dorse,
   Dorsel, Dosel.]
   1. (Anat.) Pertaining to, or situated near, the back, or
      dorsum, of an animal or of one of its parts; notal;
      tergal; neural; as, the dorsal fin of a fish; the dorsal
      artery of the tongue; -- opposed to ventral.
      [1913 Webster]

   2. (Bot.)
      (a) Pertaining to the surface naturally inferior, as of a
          leaf.
      (b) Pertaining to the surface naturally superior, as of a
          creeping hepatic moss.
          [1913 Webster]

   Dorsal vessel (Zool.), a central pulsating blood vessel
      along the back of insects, acting as a heart.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dorsal
    adj 1: belonging to or on or near the back or upper surface of
           an animal or organ or part; "the dorsal fin is the
           vertical fin on the back of a fish and certain marine
           mammals" [ant: ventral]
    2: facing away from the axis of an organ or organism; "the
       abaxial surface of a leaf is the underside or side facing
       away from the stem" [syn: abaxial, dorsal] [ant:
       adaxial, ventral]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "dorsal":
   accented, alveolar, apical, apico-alveolar, apico-dental,
   articulated, assimilated, back, barytone, bilabial, broad,
   cacuminal, central, cerebral, checked, close, consonant,
   consonantal, continuant, dental, dissimilated, flat, front, glide,
   glossal, glottal, gluteal, guttural, hard, heavy, high, intonated,
   labial, labiodental, labiovelar, lateral, lax, light, lingual,
   liquid, low, lumbar, mid, monophthongal, muted, narrow, nasal,
   nasalized, occipital, occlusive, open, oxytone, palatal,
   palatalized, pharyngeal, pharyngealized, phonemic, phonetic,
   phonic, pitch, pitched, posterial, posttonic, retral, retroflex,
   rounded, sciatic, semivowel, soft, sonant, stopped, stressed,
   strong, surd, syllabic, tense, tergal, thick, throaty, tonal,
   tonic, twangy, unaccented, unrounded, unstressed, velar, vocalic,
   vocoid, voiced, voiceless, vowel, vowellike, weak, wide