Earlier Established Forms
- found: Amer. Heritage dict. (camera obscura; camera obscuras: a darkened chamber in which the real image of an object is received through a small opening or lens and focused in natural color onto a facing surface rather than recorded on a film or plate)
- found: Random House (camera obscura; no plural form listed)
- found: Web. 3 (camera obscura; camera obscuras)
- found: AAT (camera obscuras)
- 1986-02-11: new
- 1995-02-28: revised
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