ELLIPSE
ellipse, oval
(noun) 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”
Source: WordNet® 3.1
Etymology
Noun
ellipse (plural ellipses)
(geometry) A closed curve, the locus of a point such that the sum of the distances from that point to two other fixed points (called the foci of the ellipse) is constant; equivalently, the conic section that is the intersection of a cone with a plane that does not intersect the base of the cone.
Synonyms
• oval (in non-technical use)
Verb
ellipse (third-person singular simple present ellipses, present participle ellipsing, simple past and past participle ellipsed)
(grammar) To remove from a phrase a word which is grammatically needed, but which is clearly understood without having to be stated.
Source: Wiktionary
El*lipse", n. Etym: [Gr. ellipse. See Ellipsis.]
1. (Geom.)
Definition: An oval or oblong figure, bounded by a regular curve, which
corresponds to an oblique projection of a circle, or an oblique
section of a cone through its opposite sides. The greatest diameter
of the ellipse is the major axis, and the least diameter is the minor
axis. See Conic section, under Conic, and cf. Focus.
2. (Gram.)
Definition: Omission. See Ellipsis.
3. The elliptical orbit of a planet.
The Sun flies forward to his brother Sun; The dark Earth follows
wheeled in her ellipse. Tennyson.
Source: Webster’s Unabridged Dictionary 1913 Edition