AmbitusThe exterior edge or border of a thing, as the border of a leaf, or the outline of a bivalve shell.
Century Dictionary and Cyclopedia
nambitusA going round; a circuit; the circumference, periphery, edge, or border of a thing, as of a leaf or the valve of a shell.
nambitusIn architecture, an open space surrounding a building or a monument.
nambitusIn antiquity, an open space about a house separating it from adjoining dwellings, and representing the ancient sacred precinct around a family hearth. In Rome the width of the ambitus was fixed by law at 2½ feet.
nambitusIn ancient Rome, the act of canvassing for public office or honors. See ambition, 1.—5. In logic, the extension of a term.
nambitusIn Gregorian music. the range or compass of a melody.
nambitusIn the flat seaurchins or echinoids, the peripheral or equatorial area of the test which is not transsected by the ambulacra.