- plural of focus.
foci
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
For it was very difficult to define the Places of the Foci, without some little Errors.
From Opticks or, a Treatise of the Reflections, Refractions, Inflections, and Colours of Light by Newton, Isaac, Sir
Suppose you have four laya centers in Europe: four Foci through which psychic impulses from the Oversoul pour through into this world.
From The Crest-Wave of Evolution A Course of Lectures in History, Given to the Graduates' Class in the Raja-Yoga College, Point Loma, in the College-Year 1918-19 by Morris, Kenneth
Foci are also met with in the upper end of the ulna.
From Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. by Miles, Alexander
Let A, B, C, D be an ellipse representing the orbit of the earth, and let S represent the sun situated at one of the Foci.
From Aether and Gravitation by Hooper, William George
Prop 29, 30, there is an elegant Method of determining these Foci; not only in spherical Surfaces, but likewise in any other curved Figure whatever: And in Prop.
From Opticks or, a Treatise of the Reflections, Refractions, Inflections, and Colours of Light by Newton, Isaac, Sir