👉 The term "semihyperbola" is a mathematical concept that refers to an ellipse with both its principal axis and conjugate axis vertical. It is also known as an oblique hyperbola, but it's not strictly related to the concept of a semihyperbola because a semihyperbola is defined by having one focus at the origin and two foci on either side of the major axis. A semihyperbola is thus a special case of an ellipse