asymtote
/ˈæsɪmptoʊt/Definitions
1. noun
A line or curve that approaches a point but never intersects it, especially in the study of algebraic and transcendental curves.
“The graph of the function showed a horizontal asymptote at y=0.”
2. verb
To have an asymptote or asymptotes, especially in mathematics.
“The curve asymptotes the x-axis as x approaches infinity.”