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Plácido's disk

[plah-si-dohz]
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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