micrometer

Meanings

1. 1
   noun

   caliper for measuring small distances

2. 2
   noun

   a metric unit of length equal to one millionth of a meter

3. 3
   noun

   A device used to measure distance very precisely but within a limited range, especially depth, thickness, and diameter.

4. 4
   noun

   US spelling of micrometre (“one-millionth of a metre”).

Etymology

From micro- (“one millionth”) + meter.