| avail | To be of use or advantage; to answer the purpose; to have strength, force, or efficacy sufficient to accomplish the object; as, the plea in bar must avail, that is, be sufficient to defeat the suit; this scheme will not avail; medicines will not avail to check the disease. Source: Websters Dictionary (01 Mar 1998) |
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| available arch length | <dentistry> The amount of space available for the permanent teeth around the dental arch from the first permanent molar on the left to the first permanent molar on the right. (05 Mar 2000) |
| avalanche conduction | <physiology> The discharge of an impulse from a neuron into a large number of neurons of the same physiologic system. This produces an amplification effect, thus producing a very large amount of nervous energy for a given stimulus. (05 Mar 2000) |
| avalvular | <anatomy> Without valves. Synonym: nonvalvular (05 Mar 2000) |
| avascular | <pathology> Without blood or lymphatic vessels; may be a normal state as in certain forms of cartilage, or the result of disease. Synonym: nonvascular. (05 Mar 2000) |
| avascular necrosis | <radiology> Aetiology (PLASTIC RAGS): P pancreatitis, L lupus, A alcohol, S steroids, T trauma, I idiopathic, infection, C caisson disease, collagen vascular disease, R radiation, rheumatoid arthritis, A amyloid, G Gaucher disease, S sickle cell disease findings: sclerosis, crescent sign, collapse (e.g., of femoral head) see also: staging (12 Dec 1998) |
| avascular necrosis staging | <radiology> Stage CT/X-ray bone scan I - cold/hot spot II sclerotic focus with osteopenic ring III crescent sign (subchondral lucency) IV articular collapse flattening of femoral head sensitivity 86% 78% specificity 79% 75% see also: avascular necrosis (AVN) (12 Dec 1998) |
| avascularization | 1. Expulsion of blood from a part, as by means of an Esmarch tourniquet or arterial compression. 2. Loss of vascularity, as by scarring. (05 Mar 2000) |
| avatar | 1. The descent of a deity to earth, and his incarnation as a man or an animal; chiefly associated with the incarnations of Vishnu. 2. Incarnation; manifestation as an object of worship or admiration. Origin: Skr. Avatara descent; ava from + root t to cross, pass over. Source: Websters Dictionary (01 Mar 1998) |
| Avellis | <person> Georg, German laryngologist, 1864-1916. See: Avellis' syndrome. (05 Mar 2000) |
| Avellis' syndrome | <syndrome> Unilateral paralysis of the larynx and velum palati, with contralateral loss of pain and temperature sensibility in the parts below. Synonym: jugular foramen syndrome. (05 Mar 2000) |
| avena | <botany> A genus of grasses, including the common oat (Avena sativa); the oat grasses. Origin: L. Source: Websters Dictionary (01 Mar 1998) |
| avenacinase | <enzyme> A 110 kD saponin-detoxifying enzyme from fungus, gaeumannomyces graminis; removes both the beta-1,2- and beta-1,4-linked terminal d-glucose molecules from oat root saponin a-1 to give first the mono- and then the bis-deglucosylated form, both are less toxic to the fungus Registry number: EC 3.2.1.- Synonym: avenacinase gene product (26 Jun 1999) |
| avenacosidase | <enzyme> A 60-kD protein that copurifies with phytochrome; a part of the defense system of avena sativa; genbank x78433 Registry number: EC 3.2.1.- Synonym: p60 protein, avena (26 Jun 1999) |
| avenge | 1. To take vengeance for; to exact satisfaction for by punishing the injuring party; to vindicate by inflicting pain or evil on a wrongdoer. 2. To treat revengefully; to wreak vengeance on. "Thy judgment in avenging thine enemies." (Bp. Hall) To avenge is to inflict punishment upon evil doers in behalf of ourselves, or others for whom we act; as, to avenge one's wrongs; to avenge the injuries of the suffering and innocent. It is to inflict pain for the sake of vindication, or retributive justice. To revenge is to inflict pain or injury for the indulgence of resentful and malicious feelings. The former may at times be a duty; the latter is one of the worst exhibitions of human character. Origin: OF. Avengier; L. Ad + vindicare to lay claim to, to avenge, revenge. See Vengeance. Source: Websters Dictionary (01 Mar 1998) |