| TARA | total articular replacement arthroplasty; tumor-associated rejection antigen |
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| ACN | acute conditioned neurosis; Ambulatory Care Network; American College of Neuropsychiatrists; America... |
| ANN | artificial neural network |
| ARPANET | Advanced Research Projects Agency Network |
| ATN | acute tubular necrosis; augmented transition network |
| vascular lacuna | <anatomy> The medial compartment beneath the inguinal ligament, for the passage to the femoral vessels; it is separated from the muscular lacuna by the iliopectineal arch. Synonym: lacuna vasorum. (05 Mar 2000) |
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| vascular lamina of choroid | <anatomy> The outer portion of the choroid of the eye containing the largest blood vessels. Synonym: lamina vasculosa choroideae, Haller's vascular tissue, uvaeformis, vascular layer of choroid coat of eye, vascular layer. (05 Mar 2000) |
| vascular layer | <anatomy> The outer portion of the choroid of the eye containing the largest blood vessels. Synonym: lamina vasculosa choroideae, Haller's vascular tissue, uvaeformis, vascular layer of choroid coat of eye, vascular layer. (05 Mar 2000) |
| vascular layer of choroid coat of eye | <anatomy> The outer portion of the choroid of the eye containing the largest blood vessels. Synonym: lamina vasculosa choroideae, Haller's vascular tissue, uvaeformis, vascular layer of choroid coat of eye, vascular layer. (05 Mar 2000) |
| vascular leiomyoma | <tumour> A markedly vascular leiomyoma, apparently arising from the smooth muscle of blood vessels. Synonym: angioleiomyoma, angiomyofibroma, angiomyoma. (05 Mar 2000) |
| vascular meninx | <anatomy> Rarely used term for pia mater. Synonym: meninx vasculosa. (05 Mar 2000) |
| vascular murmur | <cardiology> A murmur originating in a blood vessel. (05 Mar 2000) |
| vascular neoplasms | <oncology> Neoplasms located in vascular tissue or specific veins. They are differentiated from neoplasms, vascular tissue which are neoplasms composed of vascular tissue, such as angiofibroma or haemangioma. (12 Dec 1998) |
| vascular nerve | <anatomy, nerve> A small nerve filament that supplies the wall of a blood vessel. Synonym: nervus vascularis. (05 Mar 2000) |
| vascular occlusion | A sudden blockage of a blood vessel usually with a blood clot. Blockage of a vein results in deep venous thrombosis. Blockage of an artery results in a surgical emergency. (27 Sep 1997) |
| vascular patency | The condition of blood vessels not being blocked or obstructed. (12 Dec 1998) |
| vascular pedicle | The tissues containing arteries and veins of an organ, specifically in chest radiology, the (width of the) mediastinum at the level of the aortic arch and superior vena cava. (05 Mar 2000) |
| vascular plant | A plant which possesses a well-developed system of conducting tissue to transport water, mineral salts and sugars. (09 Oct 1997) |
| vascular plexus | A vascular network formed by frequent anastomoses between the blood vessels (arteries or veins) of a part. Synonym: plexus vasculosus. (05 Mar 2000) |
| vascular polyp | A bulging or protruding angioma of the nasal mucous membrane. Synonym: bleeding polyp. (05 Mar 2000) |