| halometer | An instrument used to measure the diffraction halo of a red blood cell; based on the premise that the halo of the large erythrocyte of pernicious anaemia is smaller than that of the normal cell; the hazy colourless halo of normal size is characteristic of secondary anaemia. (05 Mar 2000) |
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| halometer |
1. an instrument for measuring ocular halos; see halo (def. 1). 2. an instrument for estimating the size of erythrocytes by measuring the halos formed around them when a beam of light shines on them and is diffracted.
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