| tache noire | Black spot (in French), a small ulcer covered with a black crust at the site of a tick bite, characteristic of several tick-borne rickettsial diseases. (12 Dec 1998) |
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| tachetic | Marked by bluish or brownish spots. Origin: Fr. Tache, spot (05 Mar 2000) |
| tachhydrite | <chemical> A hydrous chloride of calcium and magnesium occurring in yellowish masses which rapidly deliquesce upon exposure. It is found in the salt mines at Stassfurt. Origin: Gr. Quick + water. So named from its ready deliquescence. Source: Websters Dictionary (01 Mar 1998) |
| tachina | Origin: NL, fr. Gr, for swift. <zoology> Any one of numerous species of Diptera belonging to Tachina and allied genera. Their larvae are external parasites of other insects. Source: Websters Dictionary (01 Mar 1998) |
| tachistesthesia | An obsolete term for recognition of light flicker. Origin: G. Tachistos, very rapid, from tachys, rapid, + aesthesis, perception (05 Mar 2000) |
| tachistoscope | <instrument> An instrument to determine the shortest time an object must be exposed in order to be perceived. Origin: G. Tachistos, very rapid, fr. Tachys, rapid, + skopeo, to view (05 Mar 2000) |
| tachogram | Record made by a tachometer. Origin: G. Tachos, speed, + gramma, mark (05 Mar 2000) |
| tachograph | A tachometer designed to provide a continuous record of speed or rate. Origin: G. Tachos, speed, + grapho, to write (05 Mar 2000) |
| tachography | The recording of speed or rate. Origin: G. Tachos, speed, + grapho, to write (05 Mar 2000) |
| tachometer | An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance. Specifically: An instrument for measuring the velocity of running water in a river or canal, consisting of a wheel with inclined vanes, which is turned by the current. The rotations of the wheel are recorded by clockwork. An instrument for showing at any moment the speed of a revolving shaft, consisting of a delicate revolving conical pendulum which is driven by the shaft, and the action of which by change of speed moves a pointer which indicates the speed on a graduated dial. <physiology> An instrument for measuring the velocity of the blood; a haematachometer. Origin: Gr. Swiftness, speed (fr. Quick): cf. F. Tachometre. Source: Websters Dictionary (01 Mar 1998) |
| tachy- | Rapid. Origin: G. Tachys, quick (05 Mar 2000) |
| tachyarrhythmia | <cardiology> A tachycardia associated with an irregularity in the normal heart rhythm. Origin: Gr. Rhythmos = rhythm (18 Nov 1997) |
| tachyauxesis | Type of growth in which a part grows more rapidly than the whole. Origin: tachy-+ G. Auxo, to increase (05 Mar 2000) |
| tachybradycardia syndrome | <syndrome> Alternate rapid and slow cardiac rates that may represent any rhythm disturbances in any combination usually related to sinus node disease. Synonym: tachybradycardia syndrome. (05 Mar 2000) |
| tachycardia | <clinical sign> The excessive rapidity in the action of the heart, the term is usually applied to a heart rate above 100 per minute and may be qualified as atrial, junctional (nodal) or ventricular and as paroxysmal. Origin: Gr. Kardia = heart (18 Nov 1997) |