diopter Hear it!

diopter definition

di·op·ter or dioptre di·op′·tre (dī äp′tər)

noun

a unit of measure of the power of a lens, equal to the power of a lens with a focal length of one meter

Etymology: Fr dioptre < L dioptra < Gr instrument for leveling, etc. < dia-, through + base of opsis, sight < ops, eye

Related Forms:

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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