tangent

nouns

a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point
is derived from
is derived from
is a type of (narrower)
a line traced by a point traveling in a constant direction; a line of zero curvature
"the shortest distance between two points is a straight line"
ratio of the opposite to the adjacent side of a right-angled triangle
is derived from