noun
millimeter
A metric unit of length equal to one thousandth of a meter.
Each small mark on this ruler represents one millimeter.
Etymology
The metric prefix milli- specifies one thousandth of the named unit. Attached to meter, it creates the name for one thousandth of a meter.
More examples
- The glass is four millimeters thick.
- The forecast calls for ten millimeters of rain.
- Move the shelf a few millimeters to the left.
Forms
millimeter · millimeters
Similar words
- centimeter
- A metric length unit equal to ten millimeters.
- meter
- A metric length unit equal to one thousand millimeters.