plácido-disk

Plácido's disk

[plah-si-dohz]
noun Ophthalmology.
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
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