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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Overview of âLactulose for Canines and Felines. 1  Lactulose, also known as ChronulacÂ®, CephulacÂ®, ConstilacÂ® or KristaloseÂ®, is a special type of laxative used to treat constipation and to assist in the management of a disorder called hepatic encephalopathy in dogs and cats.