cotangential
/kɒtændʒəntiəl/ (KOT-an-JEN-tee-uhl)
Definitions
1. adjective
Having a common tangent; meeting at a single point, especially at a tangent.
“The two lines are cotangential at the point of intersection.”
2. noun
A line or curve that is cotangential to another.
“The cotangential lines form a unique geometric shape.”