Etymology
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Words related to -meter

*me- (2)
*mē-, Proto-Indo-European root meaning "to measure." Some words may belong instead to root *med- "to take appropriate measures."

It forms all or part of: amenorrhea; centimeter; commensurate; diameter; dimension; gematria; geometry; immense; isometric; meal (n.1) "food, time for eating;" measure; menarche; meniscus; menopause; menses; menstrual; menstruate; mensural; meter (n.1) "poetic measure;" meter (n.2) unit of length; meter (n.3) "device for measuring;" -meter; Metis; metric; metrical; metronome; -metry; Monday; month; moon; parameter; pentameter; perimeter; piecemeal; semester; symmetry; thermometer; trigonometry; trimester.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mati "measures," matra "measure;" Avestan, Old Persian ma- "to measure;" Greek metron "measure," metra "lot, portion;" Latin metri "to measure."
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altimeter (n.)
"instrument for measuring altitudes," 1918, from alti- "high" + -meter.
ammeter (n.)
instrument for measuring the strength of electric currents, 1882, from ampere + -meter.
anemometer (n.)
"wind-gage, instrument for indicating the velocity of the wind," 1727, from anemo- "wind" + -meter. Related: Anemometry; anemometric.
barometer (n.)

1660s, from Greek baros "weight" (from suffixed form of PIE root *gwere- (1) "heavy") + -meter. The name probably was coined (and certainly popularized) by English scientist Robert Boyle (1627-1691). The instrument was invented 1643 by Italian physicist Evangelista Torricelli and was at first known as the Torricelli tube.

calorimeter (n.)

"apparatus for measuring heat given off by a body," 1794, from Latin calor "heat" (from PIE root *kele- (1) "warm") + -meter. A hybrid word. Related: Calorimetric; calorimetry.

chronometer (n.)

"any instrument that measures time or divides it into equal portions," especially "a time-keeper of great accuracy," 1735, from chrono- "time" + -meter. Related: Chronometric; chronometry.

clinometer (n.)
"measurer of slopes and elevations," 1811, from clino- + -meter. Related: Clinometric.
densimeter (n.)

"apparatus for ascertaining the comparative density of a solid or liquid," 1848; see dense + -meter.

galvanometer (n.)
instrument for detecting and measuring electric current, 1801, from galvano-, used as a combining form of galvanism + -meter. Related: Galvanometric. Galvanoscope "instrument for detecting and determining the direction of electric current" is from 1832.