Destrer \Des*trer"\, Dextrer \Dex"trer\, n. [OF. destrier, fr. L. dextra on the right side. The squire led his master's horse beside him, on his right hand. Skeat.] A war horse. [Obs.] --Chaucer. Dextrer \Dex*trer"\, n. A war horse; a destrer. [Obs.] ``By him baiteth his dextrer.'' --Chaucer.