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immersion

Pronunciation: i-mer'zhun

Definition:

  1. The placing of a body under water or other liquid.
  2. microscopy filling the space between the objective lens and the top of the cover glass with a fluid, such as water or oil, to reduce spheric aberration and increase effective numeric aperture by elimination of refractive effects that result from an air-glass interface; the best resolution is achieved when the space between the condenser lens and the specimen slide is also filled with the fluid.

[L. immergo, pp. -mersus, to dip in (in + mergo)]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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