| obturator foramen | A large, oval or irregularly triangular aperture in the hip bone, the margins of which are formed by the pubis and the ischium; it is closed in the natural state by the obturator membrane, except for a small opening for the passage of the obturator vessels and nerve. Synonym: foramen obturatum. (05 Mar 2000) |
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| obturator groove | A deep groove on the inner surface of the superior ramus of the pubis. Synonym: sulcus obturatorius. (05 Mar 2000) |
| obturator hernia | Hernia through the obturator foramen. (05 Mar 2000) |
| obturator internus | <anatomy, muscle> Origin, pelvic surface of obturator membrane and margin of obturator foramen; insertion, passes out of pelvis through lesser sciatic foramen, in so doing, making a 90 |
| obturator lymph nodes | Nodes of the internal iliac group located along the obturator artery. Synonym: nodi lymphatici obturatorii. (05 Mar 2000) |
| obturator membrane | The thin membrane of strong interlacing fibres filling the obturator foramen. Synonym: membrana obturatoria. (05 Mar 2000) |
| obturator nerve | <anatomy, nerve> A nerve originating in the lumbar spinal cord (l2 to l4) and traveling through the lumbar plexus to the lower extremity. The obturator nerve provides motor innervation to the adductor muscles of the thigh and cutaneous sensory innervation of the inner thigh. (12 Dec 1998) |
| obturator tubercle | One of two processes, anterior and posterior, on the margin of the pubic portion of the obturator foramen, bounding the termination of the obturator groove. Synonym: tuberculum obturatorium. (05 Mar 2000) |
| obturator vein | <anatomy, vein> Formed by the union of tributaries draining the hip joint and the obturator and adductor muscles of the thigh; it enters the pelvis by the obturator canal as venae comitantes of the obturator artery and empties into the internal iliac vein. Synonym: vena obturatoria. (05 Mar 2000) |
| obtuse | Blunt or rounded at the apex, the converging edges separated by an angle greater than 90 degrees. (09 Oct 1997) |
| obtusion | 1. Dullness of sensibility. 2. A dulling or deadening of sensibility. (05 Mar 2000) |
| obumbrant | <zoology> Overhanging; as, obumbrant feathers. Origin: L.obumbrans, p.pr. Source: Websters Dictionary (01 Mar 1998) |
| obverse | Having the base, or end next the attachment, narrower than the top, as a leaf. Origin: L. Obversus, p.p. Of obvertere. See Obvert. 1. The face of a coin which has the principal image or inscription upon it; the other side being the reverse. 2. Anything necessarily involved in, or answering to, another; the more apparent or conspicuous of two possible sides, or of two corresponding things. "The fact that it [a belief] invariably exists being the obverse of the fact that there is no alternative belief." (H. Spencer) Origin: Cf.F. Obverse, obvers. See Obverse. Source: Websters Dictionary (01 Mar 1998) |
| obvoluted | Overlapping; contorted; convolute; applied primarily, in botany, to two opposite leaves, each of which has one edge overlapping the nearest edge of the other, and secondarily to a circle of several leaves or petals which thus overlap. Origin: L. Obvolutus, p.p. Of obvolvere to wrap round; ob (see Ob-) + volvere to roll. Source: Websters Dictionary (01 Mar 1998) |
| oca | <botany> A Peruvian name for certain species of Oxalis (O. Crenata, and O. Tuberosa) which bear edible tubers. Origin: Sp. Source: Websters Dictionary (01 Mar 1998) |