The Collaborative International Dictionary of English v.0.48:
Anticlinal \An`ti*cli"nal\ ([a^]n`t[i^]*kl[imac]"nal), a. [Pref.
anti- + Gr. kli`nein to incline.]
1. Inclining or dipping in opposite directions. See
2. (Bot.) occurring at right angles to the surface of a plant
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.