<B>tacet, </B>intransitive verb.<DL COMPACT><DD> (Music.) to be silent (used as an indication that an instrument or voice is to be silent for a time). </DL>
<A NAME="tache">
<B>tache</B> or <B>tach, </B>noun.<DL COMPACT><DD> (Archaic.) <DD><B> 1. </B>any device for fastening, such as a clasp, buckle, hook and eye, or hook. <BR> <I>Ex. Taches of gold ... connecting together the curtains of the tabernacle (Hugh Macmillan).</I> <DD><B> 2. </B>(Figurative:) <BR> <I>Ex. Finally, the word became ... a tach between the external object and the internal impression (Frederic W. Farrar).</I> (SYN) link, bond. </DL>
<A NAME="tacheometer">
<B>tacheometer, </B>noun. =tachymeter.</DL>
<A NAME="tachinafly">
<B>tachina fly,</B><DL COMPACT><DD> any one of a group of dipterous insects resembling the housefly whose larvae are parasitic in caterpillars and other insects. </DL>
<A NAME="taching">
<B>Ta Ch'ing,</B><DL COMPACT><DD> the Manchu dynasty, 1644-1912; Ch'ing. </DL>
<A NAME="tachinid">
<B>tachinid, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> of or belonging to a family of thick-set, quick-moving dipterous insects including the tachina fly. <DD><I>noun </I> a tachinid insect. </DL>
<A NAME="tachiol">
<B>tachiol, </B>noun.<DL COMPACT><DD> a yellowish, crystalline compound, used as an antiseptic; silver fluoride. </DL>
<A NAME="tachisme">
<B>tachisme</B> or <B>tachism, </B>noun.<DL COMPACT><DD> a style of painting in which colors are splashed or daubed on the canvas, allowing impulse rather than conscious effort to control the form and content of the picture; action painting. </DL>
<A NAME="tachist">
<B>tachist, </B>noun, adjective. =tachiste.</DL>
<A NAME="tachiste">
<B>tachiste, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> a painter who uses the style or technique of tachisme. <DD><I>adj. </I> of or having to do with tachisme or tachistes. <BR> <I>Ex. The eucalyptus trees with their stringy bark like dribbled tachiste paintings drooped (Manchester Guardian).</I> </DL>
<A NAME="tachistoscope">
<B>tachistoscope, </B>noun.<DL COMPACT><DD> an apparatus which exposes to view, for a selected brief period of time, an object or group of objects such as letters or words. The tachistoscope is used especially in experimental psychology. </DL>
<A NAME="tachistoscopic">
<B>tachistoscopic, </B>adjective.<DL COMPACT><DD> of or having to do with a tachistoscope. <BR> <I>Ex. ... tachistoscopic flashes on a screen (Bulletin of Atomic Scientists).</I> </DL>
<A NAME="tachogram">
<B>tachogram, </B>noun.<DL COMPACT><DD> a record made by a tachograph. </DL>
<A NAME="tachograph">
<B>tachograph, </B>noun.<DL COMPACT><DD><B> 1. </B>a tachometer which makes a record of its readings over a period of time. <DD><B> 2. </B><B>=tachogram.</B> </DL>
<A NAME="tachometer">
<B>tachometer, </B>noun.<DL COMPACT><DD><B> 1. </B>an instrument for measuring the speed of rotation, as of a shaft or wheel. <DD><B> 2. </B>any one of various instruments for measuring or indicating speed, as of a river or the blood. </DL>
<A NAME="tachometry">
<B>tachometry, </B>noun.<DL COMPACT><DD> the measurement of velocity. </DL>
<A NAME="tachy">
<B>tachy-,</B><DL COMPACT><DD> (combining form.) swift; rapid. <BR> <I>Ex. Tachycardia = excessively fast heartbeat. Tachygraphy = the art of rapid writing.</I> </DL>
<A NAME="tachycardia">
<B>tachycardia, </B>noun.<DL COMPACT><DD> (Medicine.) excessively fast heartbeat. </DL>
<A NAME="tachycardiac">
<B>tachycardiac, </B>adjective, noun.<DL COMPACT><DD> (Medicine.) <DD><I>adj. </I> of or having to do with tachycardia. <DD><I>noun </I> a person with tachycardia. <BR> <I>Ex. One of my tachycardiacs began to ride a bicycle two years ago, and with much advantage (Thomas C. Allbutt).</I> </DL>
<A NAME="tachygraph">
<B>tachygraph, </B>noun.<DL COMPACT><DD><B> 1. </B>a tachygraphic writing or manuscript. <DD><B> 2. </B>a writer of shorthand. <BR> <I>Ex. The other tachygraph, Phocas, had also reported this sermon (Frederic W. Farrar).</I> <DD><B> 3. </B>a device for measuring the rate of flow of arterial blood. </DL>
<A NAME="tachygrapher">
<B>tachygrapher, </B>noun.<DL COMPACT><DD> a writer of shorthand. </DL>
<B>tachygraphy, </B>noun.<DL COMPACT><DD><B> 1. </B>the art or practice of writing quickly. <DD><B> 2. </B>shorthand, especially the ancient Greek and Roman form. <DD><B> 3. </B>the art of writing in abbreviations, as in some Greek and Latin written in the Middle Ages. <DD><B> 4. </B>cursive as letters. </DL>
<A NAME="tachylyte">
<B>tachylyte</B> or <B>tachylite, </B>noun.<DL COMPACT><DD> a black, glassy basalt of volcanic origin that is readily fusible. <BR> <I>Ex. Tachylites commonly occur as bombs and cinders, or scoria, thrown out by volcanoes (Fenton and Fenton).</I> </DL>
<B>tachymeter, </B>noun.<DL COMPACT><DD><B> 1. </B>an instrument used especially to determine distances rapidly in a survey. <DD><B> 2. </B><B>=tachometer.</B> </DL>
<A NAME="tachymetric">
<B>tachymetric, </B>adjective.<DL COMPACT><DD> of or having to do with a tachymeter or tachymetry. </DL>
<A NAME="tachymetry">
<B>tachymetry, </B>noun.<DL COMPACT><DD> the use of the tachymeter. </DL>
<A NAME="tachyon">
<B>tachyon, </B>noun.<DL COMPACT><DD> a hypothetical elementary particle with a speed greater than that of light, whose existence has been inferred mathematically from Einstein's special theory of relativity. <BR> <I>Ex. At the velocity of light a tachyon would possess infinite energy and momentum; as the particle lost energy, it would speed up, until at zero energy its velocity would be infinite! (New Scientist).</I> </DL>
<B>tachysterol, </B>noun.<DL COMPACT><DD> (Biochemistry.) a substance formed by irradiating ergosterol, becoming calciferol when further irradiated. </DL>
<A NAME="tacit">
<B>tacit, </B>adjective.<DL COMPACT><DD><B> 1. </B>implied or understood without being openly expressed. <BR> <I>Ex. His eating the food was a tacit admission that he liked it.</I> (SYN) implicit. <DD><B> 2. </B>saying nothing; still; silent. <BR> <I>Ex. Edward Strachey was ... a man rather tacit than discursive (Thomas Carlyle).</I> <DD><B> 3. </B>unspoken; silent. <BR> <I>Ex. a tacit prayer.</I> (SYN) unuttered, unexpressed. <DD><B> 4. </B>(Law.) existing out of custom or from silent consent but not expressly stated. adv. <B>tacitly.</B> noun <B>tacitness.</B> </DL>
<A NAME="tacitean">
<B>Tacitean, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with Tacitus. <DD><B> 2. </B>having a graphic, incisive style of writing. <BR> <I>Ex. His style is uneven, but redeemed by the occasional Tacitean touch (Economist).</I> </DL>
<A NAME="taciturn">
<B>taciturn, </B>adjective.<DL COMPACT><DD> saying very little; not fond of talking; inclined to silence. <BR> <I>Ex. At the Council board he was taciturn and ... never opened his lips (Thackeray).</I> (SYN) reserved. adv. <B>taciturnly.</B> </DL>
