Plácido's disk

[ plah-si-dohz ]
/ ˈplɑ sɪˌdoʊz /

noun Ophthalmology.

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

Origin of Plácido's disk

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

Medical definitions for placido's disk

Placido's disk
[ plä-sēdōz ]

n.

keratoscope