I. mi·crom·e·ter mī-ˈkrä-mə-tər noun
Etymology: French micromètre, from micr- + -mètre -meter
Date: 1670
1. : an instrument used with a telescope or microscope for measuring minute distances
2. : a caliper for making precise measurements that has a spindle moved by a finely threaded screw
[
micrometer 2
]
II. mi·cro·me·ter ˈmī-krō-ˌmē-tər noun
Etymology: International Scientific Vocabulary micr- + meter (III)
Date: 1880
: a unit of length equal to one millionth of a meter — called also micron — see metric system table