Line That Goes From One Corner to the Opposite One
This page is the CodyCross answer for the clue below from Under the sea, Group 23, Puzzle 4.
Question is: Line That Goes From One Corner to the Opposite One
and the answer is: DIAGONAL
Word Meaning:
DIAGONAL — (geometry) Joining two nonadjacent vertices (of a polygon or polyhedron).
Definitions from Wiktionary.