%tetrameter%

n. [ L. tetrametrus, Gr. &unr_;; te`tra- (see Tetra-) + &unr_; a measure: cf. F. tétramètre. ] (GR. & Latin Pros.) A verse or line consisting of four measures, that is, in iambic, trochaic, and anapestic verse, of eight feet; in other kinds of verse, of four feet. [ 1913 Webster ]