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focal

[foh-kuh l]
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adjective
  1. of or relating to a focus.

Origin of focal

From the New Latin word focālis, dating back to 1685–95. See focus, -al1
Related formsfo·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for focal

focal

adjective
  1. of or relating to a focus
  2. situated at, passing through, or measured from the focus
Derived Formsfocally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for focal

adj.

1690s, from Modern Latin focalis; see focus + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper

focal in Medicine

focal

(fōkəl)
adj.
  1. Of or relating to a focus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.