diop'tometry

World English Dictionary
dioptometer (ˌdaɪɒpˈtɒmɪtə) [Click for IPA pronunciation guide]
 
n
an instrument for measuring ocular refraction
 
[from di-² + opt(ic) + meter]
 
diop'tometry
 
n

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Diop'tometry is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
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