peri·cline \ˈperəˌklīn\noun (-s) Etymology: Greek periklinēs, adjective, sloping on all sides 1.: a variety of albite occurring in white opaque crystals elongated in the direction of the macro-axis and often twinned with this axis as twinning axis 2.: one of the layers making up a periclinal chimera 3.: a periclinal cell wall