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Plácido's disk

[plah-si-dohz] /ˈplɑ sɪˌdoʊz/
noun, Ophthalmology
1.
a device marked with concentric black rings, used to detect corneal irregularities.
Origin
after A. Plácido da Costa (1848-1916), Portuguese ophthalmologist, who devised it
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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plácido disk in Medicine

Placido's disk Pla·ci·do's disk (plä-sē'dōz, plä'sē-duz)
n.
See keratoscope.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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