URINE

[urine] n [ME, fr. MF, fr. L urina, fr. urinari to dive; akin to Skt var water and perh. to Skt varsati it rains, Gk ourein to urinate] (14c): waste material that is secreted by the kidney in vertebrates, is rich in end products of protein metabolism together with salts and pigments, and forms a clear amber and usu. slightly acid fluid in mammals but is semisolid in birds and reptiles -- urin.ous adj