Ambitus \Am"bi*tus\ ([a^]m"b[i^]*t[u^]s), n. [L. See {Ambit},
{Ambition}.]
1. The exterior edge or border of a thing, as the border of a
leaf, or the outline of a bivalve shell.
[1913 Webster]
2. (Rom. Antiq.) A canvassing for votes.
[1913 Webster] ambivalence