1) By an ellipse 2) In an elliptical manner 3) In the form of an ellipse 1) Ovally 
• (adv.) In the form of an ellipse. • (adv.) With a part omitted; as, elliptically expressed.
El·lip'tic·al·ly adverb 1. In the form of an ellipse. 2. With a part omitted; as, elliptically expressed. 
elliptical, elliptic, elliptically 1. In geometry, in the shape or pattern of a geometric ellipse. 2. In grammar, relating to ellipsis or containing an example of ellipsis. 3. Extremely concise in speech or writing, sometimes so concise as to be difficult or impossible to understand.
in the form of an ellipse. · in an elliptical manner; by an ellipse. · with great economy of words or expression; concisely: to speak elliptically. · without sufficient transition or a logical connection between thoughts, ideas, or expressions; ambiguously or cryptically: to jump elliptically from generalities to specifics.