focus lamp
noun
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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share