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placidos disk

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Plá⋅ci⋅do'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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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