| tonic seizure | Sustained contractures of skeletal muscle as occur during convulsions. Synonym: tonic convulsion. (05 Mar 2000) |
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| tonic spasm | A continuous involuntary muscular contraction. (05 Mar 2000) |
| tonic-clonic seizure | <neurology> A type of seizure that results in loss of consciousness, generalised muscle contractions, urinary incontinence, tongue biting and a post-ictal state (confusion and lethargy) following cessation of the seizure. Synonym: grand-mal seizure. See: epilepsy. (03 Jul 1999) |
| tonicicty | <physiology> The state of healty tension or partial contraction of muscae fibres while at rest; tone; tonus. Source: Websters Dictionary (01 Mar 1998) |
| tonicity | 1. A state of normal tension of the tissues by virtue of which the parts are kept in shape, alert, and ready to function in response to a suitable stimulus. In the case of muscle, it refers to a state of continuous activity or tension beyond that related to the physical properties; i.e., it is active resistance to stretch; in skeletal muscle it is dependent upon the efferent innervation. Synonym: tonus. 2. The osmotic pressure or tension of a solution, usually relative to that of blood. See: isotonicity. Origin: G. Tonos, tone (05 Mar 2000) |
| tonicoclonic | Both tonic and clonic, referring to muscular spasms. Synonym: tonoclonic. (05 Mar 2000) |
| tonin | <enzyme> An enzyme converting angiotensin I to angiotensin II, thus similar to or identical with angiotensin-converting enzyme. (05 Mar 2000) |
| toning | The replacing of a silver deposit with one of gold in an impregnated histologic section, by treatment with a solution of gold chloride. (05 Mar 2000) |
| tonitrophobia | Synonym: brontophobia. Origin: L. Tonitrus, thunder, + G. Phobos, fear (05 Mar 2000) |
| tonka bean | <botany> The seed of a leguminous tree (Dipteryx odorata), native of Guiana. It has a peculiarly agreeable smell, and is employed in the scenting of snuff. Called also tiononquin bean. Alternative forms: tonca bean, tonga bean. Origin: Cf. F. Onca, tonka. Source: Websters Dictionary (01 Mar 1998) |
| tonnihood | <zoology> The female of the bullfinch. Synonym: tonyhoop. Source: Websters Dictionary (01 Mar 1998) |
| tono- | Tone, tension, pressure. Origin: G. Tonos (05 Mar 2000) |
| tonoclonic | Both tonic and clonic, referring to muscular spasms. Synonym: tonoclonic. (05 Mar 2000) |
| tonoclonic spasm | Convulsive contraction of muscles. (05 Mar 2000) |
| tonofibril | One of a system of fibres found in the cytoplasm of epithelial cells. See: cytoskeleton. Synonym: epitheliofibril, tenofibril. (05 Mar 2000) |