| toilet | 1. Cleansing of the obstetrical patient after childbirth or of a wound after an operation preparatory to the application of the dressing. 2. In dentistry, cavity debridement, the final step before placing a restoration in a tooth whereby the cavity is cleaned and all debris is removed. Origin: Fr. Toilette (05 Mar 2000) |
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| toilet facilities | Facilities provided for human excretion, often with accompanying handwashing facilities. (12 Dec 1998) |
| toilet training | Conditioning to defecate and urinate in culturally acceptable places. (12 Dec 1998) |
| Toison's stain | <technique> A blood diluent and leukocyte stain containing methyl violet, sodium chloride, sodium sulfate, and glycerin; also used for erythrocyte counts. (05 Mar 2000) |
| Toison, J | <person> French histologist, 1858-1950. See: Toison's stain. (05 Mar 2000) |
| tok- | From the Greek word tokos meaning childbirth, we have toc-, toco-, tok-, and toko- as combining forms, all referring to labour or childbirth. (12 Dec 1998) |
| Tok19A1 carboxylesterase | <enzyme> Thermophilic carboxylesterase from bacillus stearothermophilus; hydrolyzes a range of p-nitrophenyl esters from p-np acetate to p-np laurate; n-terminal amino acid sequence given in first source Registry number: EC 3.1.1.- Synonym: tok19a1 est (26 Jun 1999) |
| tokamak | <radiobiology> (Acronym created from the Russian words, TOroidalnaya KAmera ee MAgnitnaya Katushka, or Toroidal Chamber and Magnetic Coil.) Because the tokamak is the most common research machine for magnetic confinement fusion today, we provide several descriptions from various sources. One of several types of toroidal discharge chamber in which a longitudinal magnetic field is used to confine a plasma. The tokamak is distinguished by a plasma current running around the torus, which generates a stabilising poloidal magnetic field. An externally-applied vertical magnetic field is also used to achieve plasma equilibrium. An axisymmetric toroidal confinement device characterised by a strong toroidal magnetic field (1-10 Tesla) and a toroidal plasma current (several mega-Amps) that leads to a modest poloidal magnetic field. The plasma current is usually induced by ramping a current in a large solonoid along the symmetry axis of the tokamak. This is an inherently pulsed mode of operation, and other mechanisms of current drive are under investigation. A three component magnetoplasma toroidal construct in which the poloidal magnetic component is provided by a toroidal plasma current. The other two components are coil driven, namely, the vertical field (which opposes the major radial expansion) and the toroidal field (which acts to provide a stiff guide field for the plasma to gain more magnetohydrodynamic stability. Note: It is better to think that the toroidal or longitudinal field stiffens the plasma as against flopping or kinking, while the plasma current driven poloidal (locally azimuthal) field provides confinement pressure. Actually, the toroidal field interacting with plasma diamagnetism may also contribute to a magnetic bouyancy, which is a sort of UN-confinement (it actually gives the plasma a tendency to expand radially outward in the equatorial plane). Based on an original Soviet design, a device for containing plasma inside a torus chamber by using the combination of two magnetic fields - one created by electric coils around the torus, the other created by intense electric current in the plasma itself, which also servers to heat the plasma [partially]. (09 Oct 1997) |
| tokamak fusion test reactor | <radiobiology> Large tokamak at Princeton, first machine to use 50-50 mix of D-T fuel, current world's record holder in fusion energy production. Largest tokamak in the United States. (09 Oct 1997) |
| tokamak physics experiment | <radiobiology> Smaller successor to TFTR at Princeton. Engineering design underway, construction scheduled to begin in FY 1995. (09 Oct 1997) |
| tokay | 1. <botany> A grape of an oval shape and whitish colour. 2. A rich Hungarian wine made from Tokay grapes. Origin: Named fr. Tokay in Hungary. Source: Websters Dictionary (01 Mar 1998) |
| Tokelau ringworm | An eruption consisting of a number of concentric rings of overlapping scales forming papulosquamous patches scattered over the body; it occurs in tropical climates and is caused by the fungus Trichophyton concentricum. Synonym: herpes desquamans, Malabar itch, Oriental ringworm, scaly ringworm, tinea tropicalis, Tokelau ringworm. (05 Mar 2000) |
| token | 1. Something intended or supposed to represent or indicate another thing or an event; a sign; a symbol; as, the rainbow is a token of God's covenant established with Noah. 2. A memorial of friendship; something by which the friendship of another person is to be kept in mind; a memento; a souvenir. "This is some token from a never friend." (Shak) 3. Something given or shown as a symbol or guarantee of authority or right; a sign of authenticity, of power, good faith, etc. "Say, by this token, I desire his company." (Shak) 4. A piece of metal intended for currency, and issued by a private party, usually bearing the name of the issuer, and redeemable in lawful money. Also, a coin issued by government, especially. When its use as lawful money is limited and its intrinsic value is much below its nominal value. 5. <medicine> A livid spot upon the body, indicating, or supposed to indicate, the approach of death. "Like the fearful tokens of the plague, Are mere forerunners of their ends." (Beau. & Fl) 6. Ten and a half quires, or, commonly, 250 sheets, of paper printed on both sides; also, in some cases, the same number of sheets printed on one side, or half the number printed on both sides. 7. A piece of metal given beforehand to each person in the congregation who is permitted to partake of the Lord's Supper. 8. <chemical> A bit of leather having a peculiar mark designating a particular miner. Each hewer sends one of these with each corf or tub he has hewn. Token money, money which is lawfully current for more than its real value. See Token. Token sheet, the last sheet of each token. Origin: OE. Token, taken, AS. Tacen; akin to OFries. Teken, OS. Tekan, D. Teeken, G. Zeichen, OHG. Zeihhan, Icel. Takan, teiken, Sw. Tecken, Dan. Tegn, Goth. Taikns sign, token, gateihan to tell, show, AS. Teon to accuse, G. Zeihen, OHG. Zihan, G. Zeigen to show, OHG. Zeigon, Icel. Tja, L. Dicere to say, Gr. To show, Skr. Di. Cf. Diction, Teach. Source: Websters Dictionary (01 Mar 1998) |
| token economy | A practice whereby tokens representing money, toys, candy, etc., are given as secondary reinforcers contingent upon certain desired behaviours or performances. (12 Dec 1998) |
| toko- | Stemming from the Greek word tokos meaning childbirth, we have toc-, toco-, tok-, and toko- as combining forms, all referring to labour or childbirth. (12 Dec 1998) |