Straight Line Touching a Curve but Not Crossing It

This page is the CodyCross answer for the clue below from Airport, Group 456, Puzzle 5 (American Airlines).

Question is: Straight Line Touching a Curve but Not Crossing It

and the answer is: TANGENT

Word Meaning:

TANGENT — (differential geometry) A straight line touching a curve at a single point without crossing it there.

Definitions from Wiktionary.

Straight Line Touching A Curve But Not Crossing It - Airport CodyCross Answers | CodyCross Solutions