Emily Dickinson Lexicon

PLAT, n. [Dan. and D. plat, flat; Fr. id.; G. platt; W. plad, plâs; Gr. πλατυς, broad, L. latus; or from the root of place, G. platz. See Plot, the same word differently written. But probably these are all of one family. Τhe sense is laid, spread.]

A small piece of ground, usually a portion of flat even ground; as, a flowery plat; a plat of willows. – Milton. Spectator.