Pronunciation: (MIH-luh-MEE-ter)

A measure of length in the metric system. A millimeter is one thousandth of a meter. There are 25 millimeters in an inch.

Source: NCI Dictionary of Cancer Terms

Caption: Tumor sizes are often measured in millimeters (mm) or centimeters. Common items that can be used to show tumor size in mm include: a sharp pencil point (1 mm), a new crayon point (2 mm), a pencil-top eraser (5 mm), a pea (10 mm), a peanut (20 mm), and a lime (50 mm).

Date last modified: 2019-04-16