An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Outer; being on the outer side; situated or being outside, which is outside.
2) Outside; an exterior part or surface.

From L. exterior "outward, outer, exterior," comparative of exterus "on the outside, outward, outer, foreign," itself a comparative of → ex- "out of."

Boruni, from borun, variant of birun "out, the outside," → out.

1) Any of the four angles that do not include a region of the space between two lines intersected by a third straight line (→ transversal).
2) The angle between any side and an extension of an adjacent side of a polygon.

→ exterior; → angle.