Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Fiat(noun) an authoritative command or order to do something; an effectual decree. 2  Fiat(noun) a warrant of a judge for certain processes. 3  Fiat(noun) an authority for certain proceedings given by the Lord Chancellor's signature.
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Uh oh! Cephalexin is an antibiotic used most commonly to treat dogs with bacterial infections. The drug is an antibiotic of the cephalosporin class, completely separate from penicillin based medicines. Because of this, it is often given to pets who are allergic to penicillin.