or·tho·ker·a·tol·o·gy

[awr-thoh-ker-uh-tol-uh-jee]
noun Ophthalmology.
a technique for correcting refractive errors in vision by changing the shape of the cornea with the temporary use of progressively flatter hard contact lenses.

Origin:
1970–75; ortho- + kerato- + -logy

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Medical Dictionary

orthokeratology or·tho·ker·a·tol·o·gy (ôr'thō-kěr'ə-tŏl'ə-jē)
n.
A method of improving unaided vision by molding the cornea with contact lenses.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
00:10
Orthokeratology has a plethora of syllables.
So is cyclotrimethylenetrinitramine. Does it mean:
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
Example sentences
Advise airmen that they must follow the prescribed or proper use of orthokeratology lenses to ensure.
The use of orthokeratology or radial keratotomy methods is not acceptable for purposes of meeting this requirement.
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