Same as os. A ridge of glacial debris of considerable longitudinal extent, showing rough water-stratification: same as eskar. Also called serpent-kame.
the GNU version of the Collaborative International Dictionary of English
"In this way there arise at places where the _cabook_ stratum has again been broken up and washed away by currents of water, formations which are so bewilderingly like the ridges (_osar_) and hills with erratic blocks in Sweden and Finland that I was astonished when I saw them."