(tɛˈtræstɪkəs) adj (Botany) (of flowers or leaves on a stalk) arranged in four vertical rows
te•tras•ti•chous
(tɛˈtræs tɪ kəs)
adj. arranged in four vertical rows, as flowers on a spike. [1865–70; < New Latin tetrastichus < Greek tetrástichos having four lines or rows. See tetra-, -stichous]