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Plácido's disk

[plah-si-dohz]
noun Ophthalmology.
  1. a device marked with concentric black rings, used to detect corneal irregularities.
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Origin of Plácido's disk

after A. Plácido da Costa (1848–1916), Portuguese ophthalmologist, who devised it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

placido's disk in Medicine

Placido's disk

(plä-sēdōz)
n.
  1. keratoscope
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.