What is the Latin word for outer line?

The usual Latin words for “outer line” are extrēmitās, ambitus. The right choice depends on the sense; see the distinctions below.

English → Latin

“outer line” in Latin

extrēmitāsextremity; border, outline, perimeter; ending, suffix ambitusa going around, walking around; circuit; orbit, revolution, cycle

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

outer line

linea circum currens (forming the outline of a thing): extremitas (general term, the extremity of anything): ambitus, -us (circumference).

Quick answer

What is the Latin word for outer line?: The usual Latin words for “outer line” are extrēmitās, ambitus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.