Definitions of indicator

  1. ( chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or ( in medicine) to test for a particular reaction
  2. a device for showing the operating condition of some system
  3. a signal for attracting attention
  4. A pressure gauge; a water gauge, as for a steam boiler; an apparatus or instrument for showing the working of a machine or moving part
  5. An instrument which draws a diagram showing the varying pressure in the cylinder of an engine or pump at every point of the stroke. It consists of a small cylinder communicating with the engine cylinder and fitted with a piston which the varying pressure drives upward more or less against the resistance of a spring. A lever imparts motion to a pencil which traces the diagram on a card wrapped around a vertical drum which is turned back and forth by a string connected with the piston rod of the engine. See Indicator card ( below).
  6. A telltale connected with a hoisting machine, to show, at the surface, the position of the cage in the shaft of a mine, etc.
  7. The part of an instrument by which an effect is indicated, as an index or pointer.
  8. Any bird of the genus Indicator and allied genera. See Honey guide, under Honey.
  9. That which indicates the condition of acidity, alkalinity, or the deficiency, excess, or sufficiency of a standard reagent, by causing an appearance, disappearance, or change of color, as in titration or volumetric analysis.
  10. Any bird of the genus and allied genera. See Honey guide, under Honey.
  11. One who, or that which, points out; the part of an instrument by which an effect is pointed out.
  12. One who indicates: an instrument on a steam- engine to show the pressure.
  13. That which indicates, as a pointer.
  14. He who or that which points out or indicates; an apparatus which indicates steam pressure.
  15. He who or that which points out; a water- gauge in a steam- engine; in anat., the muscle which extends to the forefinger.

Usage examples for indicator

  1. The " fraction" drum of the indicator could be driven in either direction, known as the advance and retrograde movements, and was divided and marked in eighths. – Edison, His Life and Inventions by Frank Lewis Dyer and Thomas Commerford Martin
  2. But the indicator's wrong? – Ralph of the Roundhouse by Allen Chapman
  3. Arcot fell into step with the planet as it moved about in its orbit, and watched the speed indicator carefully. – Invaders from the Infinite by John Wood Campbell
  4. Its reception- indicator was piously placed at " Ground." – The Pirates of Ersatz by Murray Leinster
  5. Tensely we watched the chart roll slowly down till the end of the channel passed the indicator. – City of Endless Night by Milo Hastings
  6. Move indicator to 273 on C scale. – Instruction for Using a Slide Rule by W. Stanley
  7. In the same month, Hunt published an affectionate farewell to him in The Indicator. – Leigh Hunt's Relations with Byron, Shelley and Keats by Barnette Miller
  8. Joe shot a glance at his rate of climb indicator. – Frigid Fracas by Dallas McCord Reynolds
  9. Mr. Callahan's first idea was to distribute gold quotations, and to this end he devised an " indicator." – Edison, His Life and Inventions by Frank Lewis Dyer and Thomas Commerford Martin
  10. There is first the phonetic base, itself a character originally intended to represent some thing or idea, and then borrowed to represent other things and ideas similarly pronounced; and secondly, the indicator, another character added to the phonetic base in order to distinguish between the various things and ideas for which the same phonetic base was used. – China and the Chinese by Herbert Allen Giles
  11. Ishmael watched, checked the man at the turn, and finding the corn was flowing too freely, altered the indicator, and then himself took the reins and in his turn went up and down the lines of smoking earth. – Secret Bread by F. Tennyson Jesse
  12. " Thet," said Droop, slowly, " is an indicator of height above ground and tells yer direction." – The Panchronicon by Harold Steele Mackaye
  13. What's on our speed indicator? – The Passing of Ku Sui by Anthony Gilmore
  14. One indicator looked upon the Gold Room; the other opened toward the street. – Edison, His Life and Inventions by Frank Lewis Dyer and Thomas Commerford Martin