D defs.my
Entry 2 senses Webster, 1913

Ambitus

/(ăm"bĭ*tŭs)/ · Am·bi·tus · IPA /ˈæmbɪtəs/
01 n. The exterior edge or border of a thing, as the border of a leaf, or the outline of a bivalve shell.
  1. 1.
    The exterior edge or border of a thing, as the border of a leaf, or the outline of a bivalve shell.
  2. 2.
    A canvassing for votes.(Rom. Antiq.)