| os | Origin: Sw. As ridge, chain of hills, pl. Asar. <geology> One of the ridges of sand or gravel found in Sweden, etc, supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar. Source: Websters Dictionary (01 Mar 1998) |
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| os acromiale | An acromion that is joined to the scapular spine by fibrous rather than by bony union. (05 Mar 2000) |
| os basilare | The developmental basilar process of the occipital bone which unites with the condylar portions in about the fourth or fifth year, becoming the basilar part of the occipital bone. Synonym: basioccipital bone, os basilare. (05 Mar 2000) |
| os breve | One whose dimensions are approximately equal; it consists of a layer of cortical substance enclosing spongy substance and narrow. Compare: long bone. Synonym: os breve. (05 Mar 2000) |
| os calcis | The heel bone. (27 Sep 1997) |
| os capitatum | Enlarged or swollen at tip, gathered into a mass at apex, as compound stigma, a knoblike stigma terminating a style. (09 Oct 1997) |
| os centrale | A small bone occasionally found at the dorsal aspect of the wrist between the scaphoid, capitate, and trapezoid; it is developed as an independent cartilage in early foetal life but usually becomes fused with the scaphoid; it occurs normally in most monkeys. Synonym: central bone. (05 Mar 2000) |
| os centrale tarsi | A bone of the tarsus on the medial side of the foot articulating with the head of the talus, the three cuneiform bones, and occasionally the cuboid. Synonym: os naviculare, central bone of ankle, os centrale tarsi. (05 Mar 2000) |
| os clitoridis | A small bone located in the clitoris of many carnivorous mammals. It is homologous with the os penis of many male mammals. (05 Mar 2000) |
| os coccygis | <anatomy> The last bone of the spinal column, sometimes referred to as man's vestigial tail. The last portion of the vertebral column just below the sacrum. (27 Sep 1997) |
| os costale | 1. <anatomy> One of the curved bones attached to the vertebral column and supporting the lateral walls of the thorax. In man there are twelve ribs on each side, of which the upper seven are directly connected with the sternum by cartilages, and are called sternal, or true, ribs. The remaining five pairs are called asternal, or false, ribs, and of these each of the three upper pairs is attached to the cartilage of the rib above, while the two lower pairs are free at the ventral ends, and are called floating ribs. 2. That which resembles a rib in form or use. Specifically: A ridge, fin, or wing, as on a plate, cylinder, beam, etc, to strengthen or stiffen it. One of the rods on which the cover of an umbrella is extended. 3. <botany> The chief nerve, or one of the chief nerves, of a leaf. Any longitudinal ridge in a plant. Origin: AS. Rib, ribb; akin to D. Rib, G. Rippe, OHG. Rippa, rippi, Dan. Ribbe, Icel. Rif, Russ. Rebro. Source: Websters Dictionary (01 Mar 1998) |
| os coxae | A large flat bone formed by the fusion of the ilium, ischium, and pubis (in the adult), constituting the lateral half of the pelvis; it articulates with its fellow anteriorly, with the sacrum posteriorly, and with the femur laterally. Synonym: os coxae, coxa, coxal bone, innominate bone, os innominatum. (05 Mar 2000) |
| os cuboideum | The lateral bone of the distal row of the tarsus, articulating with the calcaneus, lateral cuneiform, navicular (occasionally), and fourth and fifth metatarsal bones. Synonym: os cuboideum. (05 Mar 2000) |
| os cuneiforme intermedium | A bone of the distal row of the tarsus; it articulates with the medial and lateral cuneiform, navicular, and second metatarsal bones. Synonym: os cuneiforme intermedium, mesocuneiform, middle cuneiform bone, second cuneiform bone, wedge bone. (05 Mar 2000) |
| os cuneiforme laterale | A bone of the distal row of the tarsus; it articulates with the intermediate cuneiform, cuboid, navicular, and second, third, and fourth metatarsal bones. Synonym: os cuneiforme laterale, third cuneiform bone, wedge bone. (05 Mar 2000) |