re focus

Science Dictionary
focus   (fō'kəs)  Pronunciation Key 
Plural focuses or foci (fō'sī', fō'kī')
  1. The degree of clarity with which an eye or optical instrument produces an image.

  2. See focal point.

  3. A central point or region, such as the point at which an earthquake starts.

  4. Mathematics A fixed point or one of a pair of fixed points used in generating a curve such as an ellipse, parabola, or hyperbola.

  5. The region of a localized bodily infection or disease.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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