-meter

1.
a combining form meaning “measure,” used in the names of instruments measuring quantity, extent, degree, etc.:
altimeter; barometer.
Compare -metry.
Origin
< Neo-Latin -metrum < Greek métron measure
British Dictionary definitions for -meter

-meter

combining form
1.
indicating an instrument for measuring: barometer
2.
(prosody) indicating a verse having a specified number of feet: pentameter
Word Origin
from Greek metron measure
Word Origin and History for -meter

word-forming element meaning "device or instrument for measuring; commonly -ometer, occasionally -imeter; from French -mètre, from Greek metron (see meter (n.3)).

-meter in Medicine

-meter suff.
Measuring device: refractometer.