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Figure with two foci
Answer for the clue "Figure with two foci ", 7 letters:
ellipse
Alternative clues for the word ellipse
Word definitions for ellipse in dictionaries
WordNet
Word definitions in WordNet
n. 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" [syn: oval ]
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Ellipse \El*lipse"\ ([e^]l*l[i^]ps"), n. [Gr. 'e`lleipsis, prop., a defect, the inclination of the ellipse to the base of the cone being in defect when compared with that of the side to the base: cf. F. ellipse. See Ellipsis .] (Geom.) An oval or oblong ...
Usage examples of ellipse.
An adjoining peduncle described during the same time similar, though fewer, ellipses.
Mina Gelmann wagged an admonitory finger in the direction of the bobbing blue ellipse.
As will be seen, it was full of ellipses and was fragmentary in its character, though completely effective in fact: Know all men by these Presents, et cetera, et cetera, et cetera.
On the next day it circumnutated in a greater degree, describing four irregular ellipses, and by 3 P.
Although the main petiole is continually and rapidly describing small ellipses during the day, yet after the great nocturnal rising movement has commenced, if dots are made every 2 or 3 minutes, as was done for an hour between 9.
In several other cases, for instance, when a leaf after describing during the day one or more fairly regular ellipses, zigzags much in the evening, it appears as if energy was being expended, so that the great evening rise or fall might coincide with the period of the day proper for this movement.
The most complex of all the movements performed by sleeping plants, is that when leaves or leaflets, after describing in the daytime several vertically directed ellipses, rotate greatly on their axes in the evening, by which twisting movement they occupy a wholly different position at night to what they do during the day.
But if so, it must be assumed that a bright lateral light completely stops circumnutation, for a plant thus exposed moves in a straight line towards it, without describing any ellipses or circles.
It returned also in a zigzag line, and then circumnutated regularly, describing three large ellipses during the remainder of the day.
There can be little doubt that it would ultimately have become upright by describing an additional number of irregular ellipses, one above the other.
If you go once around the epicycle while the deferent rotates once, you trace out the ellipse.
A thousand Ouster angels, some of them armed with low-yield energy weapons or recoilless rifles, opened forcefield wings and flew toward the distant Pax ships in long, tacking ellipses along the crest of the solar wind.
The pilot had wonn a crown of sorts: an ellipse of gold studded with gems half-covered its long, capacious skull.
The main petiole of a leaf having been secured to a stick, close to the base of the subpetiole of the terminal leaflet, the latter described two small ellipses between 10.
The ellipse described on the 29th had its longer axis directed at nearly right angles to a line joining the two cotyledons.