tetrameter noun & adjective. 
[tɪ'tramɪtǝ] E17.[Late Latin tetrametrus from Greek tetrametros, formed as TETRA- + metron measure.]Prosody.
A. noun. A line of four metrical feet. 
E17.b.  attrib. or as
 adjective. Consisting of a tetrameter or tetrameters. 
L18.  [TahlilGaran] English Dictionary ▲