• Webster's Revised Unabridged Dictionary
    • n. pl Osar (Geol) See 3d Os.
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Century Dictionary and Cyclopedia
    • osar Same as asar, pl. of as, os.
    • osar Same as os. A ridge of glacial debris of considerable longitudinal extent, showing rough water-stratification: same as eskar. Also called serpent-kame.
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In literature:

After its death it became an Osiris (Osar-hapi), it was embalmed, and its mummy deposited in a vault.
"History Of Ancient Civilization" by Charles Seignobos
Osar, a low ridge of stone or gravel formed by glaciers.
"A Manual of the Antiquity of Man" by J. P. MacLean
These ridges of gravel and sand are known as osars or eskers.
"The Geography of the Region about Devils Lake and the Dalles of the Wisconsin" by Rollin D. Salisbury