piperacillin

[pahy-per-uh-sil-in]

pi·per·a·cil·lin

[pahy-per-uh-sil-in]
noun Pharmacology.
a broad-spectrum semisynthetic penicillin, C23H26N5NaO7, used against certain susceptible Gram-positive and Gram-negative bacteria and certain anaerobes, especially P. aeruginosa.

Origin:
pipera(zinyl), a component of its chemical name (see piperazine, -yl) + -cillin, as in penicillin
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Piperacillin 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.
WordNet
piperacillin

noun
a synthetic type of penicillin antibiotic (trade name Pipracil) used for moderate to severe infections 
WordNet® 3.0, © 2006 by Princeton University.
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