holophote

[hol-uh-foht, hoh-luh-]

noun

an apparatus by which practically all the light from a lighthouse lamp or the like is thrown in a desired direction.

Origin of holophote

1840–50; back formation from holophotal (holo- + -photal); see photic, -al¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for holophote

Historical Examples of holophote

The focus observer is shown on the lamp in holophote, Fig. 172.
Torpedoes and Torpedo Warfare
C. W. Sleeman
The catadioptric lens, or holophote, gives a far more powerful but a more concentrated beam than the parabolic reflector.
Torpedoes and Torpedo Warfare
C. W. Sleeman