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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.
ostentatious done or designed with the intention of impressing others and consequently overly showy or grandiose; pretentious.
osteo- bone.
osteoarthritis the most common form of arthritis, resulting from wear and tear on joints and usually occurring after middle age.
osteoblast a cell that develops into bone, as during healing.
osteology the study of the skeletal system.
osteoma a nonmalignant tumor of bony tissue.
osteomalacia softening of the bones caused by vitamin and mineral deficiencies, occurring esp. in pregnant women.