glaciation (or ci as shi)

[Fr. glaciation.] 1. Ord. Lang.: The act of congealing; the state of being congealed. 2. Geol .: The state of being acted upon by ice: ice-action. Used of a country or district, a stratum or a bowlder. It consists chiefly of polished and furrowed rock-surfaces, of moraines, and erratic blocks. "Beneath the drifts were unequivocal marks of prolonged glaciation ." -Lyell: Student's Elements of Geology, ch. xii.