Source : Webster's Revised Unabridged Dictionary (1913)

Anticlinal \An`ti*cli"nal\, n. (Geol.)
   The crest or line in which strata slope or dip in opposite
   directions.

Anticlinal \An`ti*cli"nal\ (-kl[imac]"nal), a. [Pref. anti- +
   Gr. kli`nein to incline.]
   Inclining or dipping in opposite directions. See {Synclinal}.

   {Anticlinal line}, {Anticlinal axis} (Geol.), a line from
      which strata dip in opposite directions, as from the ridge
      of a roof.

   {Anticlinal vertebra} (Anat.), one of the dorsal vertebr[ae],
      which in many animals has an upright spine toward which
      the spines of the neighboring vertebr[ae] are inclined.

Source : WordNet®

anticlinal
     adj : sloping downward away from a common crest [ant: {synclinal}]