Having four forms, parts, or aspects.
Mid 17th century; earliest use found in Henry More (1614–1687), philosopher, poet, and theologian. From classical Latin quadriformis compounded of four figures, in post-classical Latin also having four forms from quadri- + -formis.
Square in shape; having four equal sides.
Late 17th century (in an earlier sense). From classical Latin quadra square + -iform.