focus lamp

noun

Definition of focus lamp

1 : an incandescent lamp having a filament coiled or crumpled into a spiral or zigzag form so that the light, being concentrated in a small space, can be brought into the focus of a lens or mirror
2 : an arc lamp with feeding mechanism so constructed as to keep the arc in a constant position with reference to the optical system by means of which its rays are focused

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Cite this Entry

“Focus lamp.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/focus%20lamp. Accessed 8 December 2019.

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