apertometer

[ap-er-tom-i-ter]

noun Optics.

an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.

Origin:
1875–80; apert(ure) + -o- + -meter

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Apertometer 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.

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