decurtate I. decurtatetransitive verb (-ed/-ing/-s) Etymology: Latin decurtatus, past participle of decurtare to curtail obsolete: shorten II. de·cur·tate\də̇ˈkərˌtāt, dēˈ-, -_tə̇t\adjective Etymology: Latin decurtatus : curtailed, shortened < a decurtate syllogism has one premise suppressed >