-cline
n combining form (Geological Science) indicating a slope: anticline.
[back formation from incline]
-clinal adj combining form
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014