a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it; "the sums of the distances from the foci to any point on an ellipse is constant"
the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points
lose clarity or turn aside especially from the main subject of attention or course of argument in writing, thinking, or speaking; "She always digresses when telling a story"; "her mind wanders"; "Don't digress when you give a lecture"