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Osiris the ancient Egyptian god of the lower world and judge of the dead whose annual resurrection was believed to personify nature's yearly renewal.
-osis condition, action, or process. [3 definitions]
-osity (such) a state, condition, or quality (used to form nouns from adjectives ending in -ose or -ous).
Oslo the capital of Norway.
osmics (used with a sing. verb) the science or study of smells and the sense of smells.
osmium a chemical element that has seventy-six protons in each nucleus and that occurs as an octavalent ion or in pure form as an extremely hard, dense, brittle bluish metal solid used as a catalyst and esp. in alloys and in electron microscopy because of its extremely high density. (symbol: Os)
osmose to undergo or subject to osmosis. [2 definitions]
osmosis the passage or diffusion of a liquid through a semipermeable membrane until the concentration is the same on both sides of the membrane, or the tendency of a liquid to diffuse in such a way. [2 definitions]
osmotic pressure the pressure created by a solvent in passing through a semipermeable membrane. (See osmosis.)
osprey a large, fish-catching hawk with a dark back and white underside; fish hawk.
ossa pl. of os1.
osseous of the substance of, containing, or similar to bone; bony.
Ossian in Gaelic legend, a hero and poet of the third century.
ossicle a small bone, esp. one of the three in the tympanic cavity of the ear.
ossify to make into or like bone. [4 definitions]
osso buco an Italian dish of veal shanks braised in white wine with vegetables and garlic.
osteal osseous; bony. [2 definitions]
osteitis inflammation of a bone or bony tissue.
ostensible apparent or stated, as opposed to real or true.
ostensive clearly or directly shown, expressed, or demonstrated. [2 definitions]
ostentation a showy display to impress others.