Definition/Meaning  Word/Phrase 
ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point 
circle

shape that is generated by rotating an ellipse around one of its axes 
ellipsoid of revolution
,
spheroid

simple leaf shaped like an ellipse 
elliptic leaf

law stating that the orbit of each planet is an ellipse with the sun at one focus of the ellipse 
Kepler's first law

longest axis of an ellipse or ellipsoid; passes through the two foci 
major axis

shorter or shortest axis of an ellipse or ellipsoid 
minor axis

convex molding having a cross section in the form of a quarter of a circle or of an ellipse 
ovolo
,
quarter round
,
thumb

onehalf the major axis of an ellipse; the distance from the center of an ellipse to one end 
semimajor axis

onehalf the minor axis of an ellipse 
semiminor axis
