An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass.
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The millionth part of a meter.
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Alt. of Millimetre
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A lineal measure in the metric system, containing the thousandth part of a meter; equal to .03937 of an inch. See 3d Meter.
Open English WordNet identifies the related term as a containing group, substance or whole.
A measure of length; the thousandth part of one millimeter; the millionth part of a meter.
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