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Plácido's disk

American  
[plah-si-dohz] / ˈplɑ sɪˌdoʊz /

noun

Ophthalmology.

  1. a device marked with concentric black rings, used to detect corneal irregularities.

Etymology

Origin of Plácido's disk

After A. Plácido da Costa (1848–1916), Portuguese ophthalmologist, who devised it

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.