autocollimator

[aw-toh-kol-uh-mey-ter]

au·to·col·li·ma·tor

[aw-toh-kol-uh-mey-ter]
noun Optics.
an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.

Origin:
auto-3 + collimator
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Autocollimator has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. 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 solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
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