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osteomalacia softening of the bones caused by vitamin and mineral deficiencies, occurring esp. in pregnant women.
osteomyelitis inflammation of the bone or bone marrow, usu. caused by a pus-producing bacterium.
osteopathy a branch of medical treatment that is based chiefly on the manipulation of bones and muscles.
osteoporosis a condition of the bone characterized by porosity and brittleness, accompanied by pain, skeletal deformities, or decreased height, and occurring esp. in women past menopause.
osteosarcoma a cancerous tumor of the bone.
osteotomy surgical division or removal of a bone or part of a bone.
ostinato a brief melodic phrase repeated over and over by the same instrument, used esp. as an accompaniment to a soloist or an ensemble passage.
ostler variant of hostler.
ostmark formerly, the chief monetary unit of East Germany, equaling one hundred pfennigs; mark.
ostracism an exclusion or rejection, as from a social group. [2 definitions]
ostracize to exclude or shun, by general agreement of the group imposing the exclusion. [2 definitions]
ostrich any of several large, powerful, flightless African birds that run swiftly and have long, unfeathered legs and neck, and two toes on each foot. [2 definitions]
Ostrogoth any member of a tribe in East Goth that conquered and ruled Italy in the fifth century. (Cf. Visigoth.)
OTB abbreviation of "off-track betting."
Othello in a tragedy by William Shakespeare, the title character, who murders his wife in the mistaken belief that she has been unfaithful.
other different from the one or ones indicated. [10 definitions]
otherwise in a different manner or other way. [4 definitions]
other world a world or existence after death. [2 definitions]
otherworldly of, relating to, or like another world, such as that of the spirit or the imagination. [2 definitions]
-otic having to do with (such) a condition, action, or process. [3 definitions]
otiose idle or lazy. [2 definitions]