| ostial | Relating to any orifice, or ostium. (05 Mar 2000) |
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| ostial sphincter | A thickening of circular muscular fibres at the level of an orifice. (05 Mar 2000) |
| coronary ostial stenosis | Narrowing of the mouths of the coronary arteries as a result of syphilitic aortitis or atherosclerosis. (05 Mar 2000) |
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