Words I Didn't Know Existed, Pt 2

"Words I Didn't Know Existed, For Normal Everyday Things That Already Have Effective Words, Part Two"

cat·e·nar·y/ˈkatəˌnerē/
Noun: A curve formed by a wire, rope, or chain hanging freely from two points that are on the same horizontal level.
Adjective: Having the form of, involving, or denoting a curve of this type.

Or you could just say, "The curve in the telephone wire."