Plácido\'s disk

[plah-si-dohz]

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. 2012.
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Plácido's disk is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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