From Wiktionary, the free dictionary
From light (noun) + room (noun).
- enPR: lītʹro͞om
- Hyphenation: light‧room
lightroom (plural lightrooms)
- (nautical) A small room from which the magazine of a naval vessel is lighted, being separated from the magazine by heavy glass windows.
- The room at the top of a lighthouse containing the lighting apparatus.