Elliptic

adjective

1. Of or pertaining to an ellipse.
2. Of or pertaining to a broad field of mathematics that originates from the problem of calculating arc lengths of an ellipse.

   "Elliptic curve"

3. (in combination, of certain functions, equations and operators) That has coefficients satisfying a condition analogous to the condition for the general equation for a conic section to be of an ellipse.

   "Elliptic operator"

4. (of leaves) Oval, with a short or no point.