Nearby Words

principal foci

principal focus

noun Optics.
focal point (def. 1).

Origin:
1825–35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Principal foci is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
the offspring of a zebra and a donkey.
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