NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,790 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

millimeter
(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.

EnlargeMillimeters; drawing shows millimeters (mm) using everyday objects. A sharp pencil point shows 1 mm, a new crayon point shows 2 mm, and a new pencil-top eraser shows 5 mm.

Millimeters (mm). A sharp pencil point is about 1 mm, a new crayon point is about 2 mm, and a new pencil eraser is about 5 mm.