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Definition of Ocular micrometer
1. Noun. (mycology biology) A measuring instrument that is inserted into the eyepiece of a microscope, used to measure microscopic features. ¹
¹ Source: wiktionary.com
Medical Definition of Ocular micrometer
1. A glass disk that fits in a microscope eyepiece and that has a ruled scale; when calibrated with a slide micrometer, direct measurements of a microscopic object can be made. (05 Mar 2000)