CONFOCAL

Etymology

Adjective

confocal (not comparable)

(optics, mathematics) Having the same foci

Noun

confocal (plural confocals)

Any of a pair of confocal mirrors or lenses

Source: Wiktionary

Con*fo"cal, a. (Math.)

Definition: Having the same foci; as, confocal quadrics.

Source: Webster’s Unabridged Dictionary 1913 Edition

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