Yellow Line on the London Underground
This page is the CodyCross answer for the clue below from Nordic Wonders, Group 1959, Puzzle 2 (Scandinavian).
Question is: Yellow Line on the London Underground
and the answer is: CIRCLE
Word Meaning:
CIRCLE — (geometry) A two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from a given point (center).
Definitions from Wiktionary.