Clinician definition, a physician or other qualified person who is involved in the treatment and observation of living patients, as distinguished from one engaged in research. See more. Dictionary.com
In geometry, the foci (/ËfoÊsaÉª/ ; singular focus) are a pair of special points with reference to which any of a variety of curves is constructed. For example, foci can be used in defining conic sections, the four types of which are the circle, ellipse, parabola, and hyperbola. In addition, foci are used to define the Cassini oval and the Cartesian oval.
Plural focuses or foci (fÅâ²sÄ«â², fÅâ²kÄ«â²) 1. A point at which rays of light come together or from which they appear to spread apart, as after passing through a lens. 2. The degree of clarity with which an eye or optical instrument produces an image: a telescope with excellent focus.