Definition of: tetrameter

(te·tram′ə·tər) adjective
Having four measures. In classical trochaic, iambic, and anapestic verse a measure consists of two feet (a dipody); hence, a trochaic tetrameter contains eight feet to the line. In English, a tetrameter has four feet or measures.
—noun A verse (line) thus composed. [<LL tetrametrus <Gk. tetrametros <tetra- four + metron measure]