Definition: posterior

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Source: WordNet (r) 1.7 

posterior
     adj : (zoology) at or near the hind end in quadrupeds or toward
           the spine in primates [ant: anterior]
     n 1: the fleshy part of the human body that you sit on [syn: buttocks,
           nates, arse, butt, backside, bum, buns, can,
           fundament, hindquarters, hind end, keister, prat,
           rear, rear end, rump, stern, seat, tail, tail
          end, tooshie, tush, bottom, behind, derriere,
           fanny, ass]
     2: a tooth situated at the back of the mouth [syn: back tooth]

Source: Webster's Revised Unabridged Dictionary (1913) 

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.

            Hesiod was posterior to Homer.        --Broome.

   2. Situated behind; hinder; -- opposed to anterior.

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

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