| obliterative arachnoiditis | Thickening of the leptomeninges, sometimes with obliteration of the subarachnoid space; commonly related to acute or chronic leptomeningitis of bacterial or chemical origin. See: leptomeningeal fibrosis. Synonym: obliterative arachnoiditis. (05 Mar 2000) |
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| oblong fovea of arytenoid cartilage | A broad shallow depression on the anterolateral surface of the arytenoid cartilage, for attachment of the thyroarytenoid muscle. Synonym: fovea oblonga cartilaginis arytenoideae, oblong pit of arytenoid cartilage. (05 Mar 2000) |
| oblong pit of arytenoid cartilage | A broad shallow depression on the anterolateral surface of the arytenoid cartilage, for attachment of the thyroarytenoid muscle. Synonym: fovea oblonga cartilaginis arytenoideae, oblong pit of arytenoid cartilage. (05 Mar 2000) |
| oblongata | <anatomy> The medulla oblongata. Source: Websters Dictionary (01 Mar 1998) |
| oblongum | Origin: NL. See Oblong. <geometry> A prolate spheroid; a figure described by the revolution of an ellipse about its greater axis. Cf. Oblatum, and see Ellipsoid of revolution, under Ellipsoid. Source: Websters Dictionary (01 Mar 1998) |