Definitions for foci
foci
fo·ci
Spelling: [foh-sahy, -kahy]
IPA: /ˈfoʊ saɪ, -kaɪ/
Foci is a 4 letter English word.
It's valid Scrabble word worth 9 points.
It's valid Words with friends word worth 10 points.
You can make 27 anagrams from letters in foci (cfio).
Definitions for foci
noun
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a plural of focus.
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a central point, as of attraction, attention, or activity:
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Physics. a point at which rays of light, heat, or other radiation meet after being refracted or reflected.
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Optics.
the focal point of a lens, on which rays converge or from which they deviate.
the focal length of a lens; the distance from a focal point to a corresponding principal plane.
the clear and sharply defined condition of an image.
the position of a viewed object or the adjustment of an optical device necessary to produce a clear image:
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Geometry. (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve.
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Geology. the point of origin of an earthquake.
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Pathology. the primary center from which a disease develops or in which it localizes.
verb (used with object)
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to bring to a focus or into focus; cause to converge on a perceived point:
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to concentrate:
verb (used without object)
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to be or become focused:
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to direct one's attention or efforts:
Origin of foci
1635-45; Latin: fireplace, hearth
Examples for foci
If c is negative, √c becomes imaginary, and there are no foci.
They are, in fact, ellipsesone of the foci being the point about which the revolution is made.
They were called "foci" and "factors," and all manner of imposing names.
At one of the points mentioned, which are the foci, let us fasten an orange.
Instead, there are two focal points, called the foci, as you will see presently.
Each one is called a focus, and an ellipse can only have one pair of foci.
Religion has two foci to determine,—the divine nature and the human.
The villages of New England—the foci of blue laws and Puritanism.
The earth's orbit is an ellipse, one of the foci of which is occupied by the sun.
It has two foci, S and S', fixed points, by the aid of which we may trace the curve.