| osteal | (adjective) composed of or containing bone | Synonyms: bony, osseous |
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| (adjective) relating to bone or to the skeleton | - |
| osteitis | (noun) inflammation of a bone as a consequence of infection or trauma or degeneration | - |
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| ostensibility | (noun) The quality of being professed, supposed rather than demonstrably true or real. | - |
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| ostensible | (adjective) represented or appearing as such; pretended | Synonyms: ostensive |
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| (adjective) appearing as such but not necessarily so | Synonyms: apparent, seeming |
| ostensibly | (adverb) from appearances alone | Synonyms: apparently, on the face of it, seemingly |
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| ostensive | (adjective) represented or appearing as such; pretended | Synonyms: ostensible |
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| (adjective) manifestly demonstrative | - |
| ostensorium | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: monstrance |
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| ostentate | (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flash, flaunt, show off, swank |
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| ostentation | (noun) pretentious or showy or vulgar display | - |
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| (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentatiousness, pomposity, pompousness, pretentiousness, puffiness, splashiness |
| (noun) a gaudy outward display | Synonyms: fanfare, flash |
| ostentatious | (adjective) intended to attract notice and impress others | Synonyms: pretentious |
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| (adjective) (of a display) tawdry or vulgar | Synonyms: pretentious |
| ostentatiously | (adverb) with ostentation; in an ostentatious manner | Synonyms: showily |
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| ostentatiousness | (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentation, pomposity, pompousness, pretentiousness, puffiness, splashiness |
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| osteoarthritis | (noun) chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age | Synonyms: degenerative arthritis, degenerative joint disease |
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| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoblastoma | (noun) benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults) | - |
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| osteochondroma | (noun) benign tumor containing both bone and cartilage; usually occurs near the end of a long bone | - |
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| osteoclasis | (noun) treatment of a skeletal deformity by intentionally fracturing a bone | - |
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| osteoclast | (noun) cell that functions in the breakdown and resorption of bone tissue | - |
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| osteocyte | (noun) mature bone cell | - |
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| osteodystrophy | (noun) defective bone development; usually attributable to renal disease or to disturbances in calcium and phosphorus metabolism | - |
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| osteologer | (noun) an anatomist who is skilled in osteology | Synonyms: osteologist |
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| osteologist | (noun) an anatomist who is skilled in osteology | Synonyms: osteologer |
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| osteology | (noun) the branch of anatomy that studies the bones of the vertebrate skeleton | - |
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| osteolysis | (noun) lysis of bone caused by disease or infection or inadequate blood supply | - |
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| osteoma | (noun) a slow growing benign tumor of consisting of bone tissue; usually on the skull or mandible | - |
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| osteomalacia | (noun) abnormal softening of bones caused by deficiencies of phosphorus or calcium or vitamin D | - |
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| osteomyelitis | (noun) an inflammation of bone and bone marrow (usually caused by bacterial infection) | - |
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| osteopath | (noun) a therapist who manipulates the skeleton and muscles | Synonyms: osteopathist |
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| osteopathist | (noun) a therapist who manipulates the skeleton and muscles | Synonyms: osteopath |
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| osteopathy | (noun) therapy based on the assumption that restoring health is best accomplished by manipulating the skeleton and muscles | - |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| osteophyte | (noun) small abnormal bony outgrowth | - |
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| osteoporosis | (noun) abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common in postmenopausal women | - |
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| osteosarcoma | (noun) malignant bone tumor; most common in children and young adults where it tends to affect the femur | Synonyms: osteogenic sarcoma |
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| osteosclerosis | (noun) abnormal hardening or eburnation of bone | - |
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| osteostracan | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: cephalaspid |
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| osteotomy | (noun) surgical sectioning of bone | - |
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| ostiarius | (noun) the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church | Synonyms: doorkeeper, ostiary |
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| ostiary | (noun) someone who guards an entrance | Synonyms: door guard, doorkeeper, doorman, gatekeeper, hall porter, porter |
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| (noun) the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church | Synonyms: doorkeeper, ostiarius |
| ostinato | (noun) a musical phrase repeated over and over during a composition | - |
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| ostiole | (noun) a small pore especially one in the reproductive bodies of certain algae and fungi through which spores pass | - |
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| ostler | (noun) someone employed in a stable to take care of the horses | Synonyms: groom, hostler, stableboy, stableman |
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| ostomy | (noun) surgical procedure that creates an artificial opening for the elimination of bodily wastes | - |
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| ostracise | (verb) avoid speaking to or dealing with | Synonyms: ostracize |
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| (verb) expel from a community or group | Synonyms: ban, banish, blackball, cast out, ostracize, shun |
| ostracism | (noun) the act of excluding someone from society by general consent | - |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: banishment, Coventry |
| ostracize | (verb) avoid speaking to or dealing with | Synonyms: ostracise |
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| (verb) expel from a community or group | Synonyms: ban, banish, blackball, cast out, ostracise, shun |
| ostracod | (noun) tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell | Synonyms: mussel shrimp, seed shrimp |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| ostrich | (noun) fast-running African flightless bird with two-toed feet; largest living bird | Synonyms: Struthio camelus |
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| (noun) a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand) | - |