Definitions of thermometer

  1. measuring instrument for measuring temperature Scrapingweb Dictionary DB
  2. An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompained by proportional changes in their volumes or dimensions. Webster Dictionary DB
  3. Measuring instruments for determining the temperature of matter. Most thermometers used in the field of medicine are designed for measuring body temperature or for use in the clinical laboratory. (From UMDNS, 1999) Medical Dictionary DB
  4. An instrument for measuring changes of temperature; as, the Fahrenheit thermometer, in which the freezing point of water is 32 degrees and the boiling 212 degrees; and the Centigrade thermometer, in which the corresponding points are 0 (zero) and 100. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
  5. An instrument for indicating the temperature of any substance. The ordinary thermometer is a sealed vacuum tube, expanded into a bulb at its lower extremity, and containing mercury; the latter expands with heat and contracts with cold, its level accordingly rising or falling in the tube, the exact degree of variation of level being indicated by a scale etched on the glass of the tube or marked on the frame which holds the tube. For measuring extreme degrees of cold, a thermometer filled with alcohol instead of mercury is used (spirit thermometer). High temperatures are measured by means of a vessel containing dry air or gas (air or gas thermometer), the expansion or increased pressure of which indicates the degree of heat. For measuring excessive heat, such as that of a furnace or pottery kiln, a special form of thermometer, in the shape of a metallic bar or other contrivance is used; this is termed a pyrometer. A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
  6. Instrument denoting temperature. Warner's pocket medical dictionary of today. By William R. Warner. Published 1898.
  7. An instrument by which the temperatures of bodies are ascertained; founded on the property which heat possesses of expanding all bodies, the rate or quantity of expansion being supposed proportional to the degree of heat applied, and hence indicating that degree. The thermometer consists of a slender glass tube, with a small bore, containing in general mercury or alcohol, which expanding or contracting by variations in the temperature of the atmosphere, or on the instrument being brought into contact with any other body, or immersed in a liquid or gas which is to be examined, the state of the atmosphere, the body, liquid, or gas, with regard to heat, is indicated by a scale either applied to the tube or engraved on its exterior surface. The ordinary thermometer consists of a small tube, terminating in a ball containing mercury, the air having been expelled and the tube hermetically sealed. There are two points on the scale, corresponding to fixed and determinate temperatures, one, namely, to the temperature of freezing water, and the other to that of boiling water. In the thermometer commonly used in this country, that of Fahrenheit, the former point is marked 32° and the latter 212°; hence the zero of the scale, or that part marked 0°, is 32° below the freezing-point, and the interval or space between the freezing- and boiling points consists of 180°. The zero point is supposed to have been fixed by Fahrenheit at the point of greatest cold that he had observed, probably by means of a freezing-mixture such as snow and salt. On the Continent, particularly in France, and nowadays in all scientific investigations, the Centigrade thermometer is used. The space between the freezing and boiling points of water is divided into 100 equal parts or degrees, the zero being at freezing and the boiling-point at 100°. Reaumur's thermometer, which is in use in Germany, has the space between the freezing and boiling points divided into 80 equal parts, the zero being at freezing. For extreme degrees of cold, thermometers filled with spirit of wine must be employed, as no degree of cold known is capable of freezing that liquid, whereas mercury freezes at about 39° below zero on the Fahrenheit scale. On the other hand, spirit of wine is not adapted to high temperatures, as it is soon converted into vapor, whereas mercury does not boil till its temperature is raised to 660° F. Mercury is most commonly used for thermometers employed for indicating all ordinary temperatures. For recording extremely high temperatures the pyrometer is used; and for indicating very slight variations the thermo-electric battery is employed. The american dictionary of the english language. By Daniel Lyons. Published 1899.
  8. An instrument for measuring degrees of temperature. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  9. Thermometric, thermometrical. The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894.
  10. Thermometric. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  11. Thermometrical. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  12. An instrument for measuring variations of temperature founded on the readiness and uniformity with which certain substances, especially mercury, expand or contract under an accession or diminution of heat. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
  13. An instr. for measuring the degree of heat or temperature of bodies by the regular expansion of mercury, or of some other substance. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  14. An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompanied by proportional changes in their volumes or dimensions. dictgcide_fs
  15. th[.e]r-mom'e-t[.e]r, n. an instrument for measuring the variations of sensible heat or temperature.--adjs. THERMOMET'RIC, -AL, pertaining to, or made with, a thermometer.--adv. THERMOMET'RICALLY.--For the Centigrade and the Fahrenheit scale and their relations to each other, see Centigrade and Fahrenheit. In the Réaumur scale, still largely used in Russia and Germany, the freezing-point is marked zero, and the space between this and boiling-point is divided into 80 degrees. To reduce it to Fahrenheit, multiply byand add 32; to Centigrade, increase the number by one-fourth of itself. Thus: F = 9/5 C + 32 = 9/4 R + 32; C = 5/9 (F - 32) = 5/4 R; R = 4/9 (F - 32) = 4/5 C.--MAXIMUM THERMOMETER, one that registers the maximum temperature to which it is exposed; MINIMUM THERMOMETER, one that registers the minimum temperature to which it is exposed. [Gr. therm[=e], heat, metron, a measure.] gutenberg.org/ebooks/37683
  16. Instrument for measuring temperature, usu. glass tube with small bore containing mercury or alcohol, & variously graduated (Fahrenheit, Reaumur, Centigrade, t., with freezing-point at 32°, 0°, 0°, boiling-point of water at 212°, 80°, 100°); clinical t. (small, with range of 25° or less, for taking temperature of the body); MAXIMUM, MINIMUM, t. Hence thermometric (AL) aa., thermometrically adv., thermometry n. Concise Oxford Dictionary
  17. An instrument for ascertaining temperatures. [See Table of the Equivalents, p. 454.] American pocket medical dictionary.
  18. n. [Greek] An instrument for measuring temperature, consisting of a slender tube, with a small bulb, and a very small bore in the stem, containing mercury or spirits of wine. Cabinet Dictionary