1 : so steep as to be nearly veritcal; "the great perpendicular face of the cliff"
2 : very steep; having a prominent and almost vertical front; "a bluff headland"; "where the bold chalk cliffs of England rise"; "a sheer descent of rock"
adjectif
1 : intersecting at or forming right angles
nom
1 : an extremely steep face
2 : a straight line at right angles to another line
