Contour

n.
  1. The outline of a figure or body, or the line or lines representing such an outline; the line that bounds; periphery.
  2. (Mil.) The outline of a horizontal section of the ground, or of works of fortification.
    3. Contour feathers (Zoöl.),
    those feathers that form the general covering of a bird.
    Contour of ground (Surv.),
    the outline of the surface of ground with respect to its undulation, etc.
    Contour line (Topographical Suv.),
    the line in which a horizontal plane intersects a portion of ground, or the corresponding line in a map or chart.