Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An instrument used to measure minute deformations in a test specimen of a material.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an electro-mechanical device for measuring changes in linear distance integral to an object undergoing deformation

from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument for measuring the extension of a body, especially for measuring the elongation of bars of iron, steel, or other material, when subjected to a tensile force.

from The Century Dictionary and Cyclopedia

  • n. An apparatus for measuring minute degrees of expansion or contraction in metal bars under the influence of temperature or under strain. See expansion.
  • n. In the instrument devised by Lavelle, a metal rod is surrounded by a steam-jacket whose temperature is indicated by two thermometers. The lower end of the rod rests at the bottom of the jacket, while the upper end passes through a movable metal cap which acts as a support for a spherometer (not shown in cut), by means of which the expansion of the rod is accurately measured.

Etymologies

extens(ion) + -meter.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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