diphenylhydantoin

[dahy-fen-l-hahy-dan-toh-in, -feen-]

di·phen·yl·hy·dan·to·in

[dahy-fen-l-hahy-dan-toh-in, -feen-]
noun Pharmacology.
a white, slightly water-soluble powder, C15H11N2O2, used in the form of its sodium salt to prevent or arrest convulsions in epilepsy.

Origin:
1935–40; diphenyl + hydantoin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Diphenylhydantoin has a plethora of syllables.
So is floccinaucinihilipilification. Does it mean:
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
WordNet
diphenylhydantoin

noun
an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative 
WordNet® 3.0, © 2006 by Princeton University.
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