bartu -bar- gismu

x₁ is on the outside of x₂; x₁ is exterior to x₂.

In notes:

calku: x₁ is a shell/husk [hard, protective covering] around x₂ composed of x₃.
jibni: x₁ is near/close to/approximates x₂ in property/quantity x₃ (ka/ni).
korbi: x₁ is an edge/margin/border/curb/boundary of x₂ next-to/bordering-on x₃.
lamji: x₁ is adjacent/beside/next to/in contact with x₂ in property/sequence x₃ in direction x₄.
nenri: x₁ is in/inside/within x₂; x₁ is on the inside/interior of x₂ [totally within the bounds of x₂].
sruri: x₁ encircles/encloses/is surrounding x₂ in direction(s)/dimension(s)/plane x₃.
vasru: x₁ contains/holds/encloses/includes contents x₂ within; x₁ is a vessel containing x₂.
barfa'u: b₁=f₁ falls outside of b₂ from (inside of) f₃
barkalyle'o: l₁=b₁ is a monocle/pair of (eye)glasses/spectacles allowing the clear sight of l₂ (light) by k₂ (wearer).
barkla: x₁=k₁ exits/goes out/outside from x₂=k₃=b₁ with route x₃=k₄ with transportation method x₅.
barklagau: g₁ ejects k₁ from b₂=k₃ via k₄ using means k₅.
barku'e: x₁ projects/extends out of x₂.
selbartu: x₂=b₁ is on the outside of x₁=b₂; x₂=b₁ is exterior to x₁=b₂.
bau'u: preposition: outside of ...