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- Able to refract, refractive
- 1884, Various, Scientific American Supplement, No. 458, October 11, 1884:
- As the colony increases, the granular character becomes more marked, until it seems to be made up of highly refractile granules, like a mass of particles of glass.
- 1913, John William Henry Eyre, The Elements of Bacteriological Technique:
- Stained bacilli, when examined with the polarising microscope, often show a doubly refractile cell wall (e. g., B. tuberculosis and B. anthracis).
- 2008 August 27, H. Roger Segelken, “Thomas H. Weller, Whose Work on Tissue Led to Nobel Prize, Is Dead at 93”, in New York Times:
- He watched daily through the microscope for characteristic signs of viral infection, and eventually saw what he later described as a “peculiar rounding of scattered cells with refractile bodies in the cytoplasm and nucleus.”