follow Dictionary.com

Why is the ninth month called September?

camera lucida

[loo-si-duh] /ˈlu sɪ də/
noun
1.
an optical instrument, often attached to the eyepiece of a microscope, by which the image of an external object is projected on a sheet of paper or the like for tracing.
Origin
1660-1670
1660-70; < Neo-Latin: bright chamber; see camera, lucid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for camera-lucida

camera lucida

/ˈluːsɪdə/
noun
1.
an instrument attached to a microscope, etc to enable an observer to view simultaneously the image and a drawing surface to facilitate the sketching of the image
Word Origin
New Latin: light chamber
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Encyclopedia Article for camera-lucida

camera lucida

(Latin: "light chamber"), optical instrument invented in 1807 by William Hyde Wollaston to facilitate accurate sketching of objects. It consists of a four-sided prism mounted on a small stand above a sheet of paper. By placing the eye close to the upper edge of the prism so that half the pupil of the eye is over the prism, the observer is able to see a reflected image of an object situated in front of the prism, apparently lying on the paper. He can then trace the image with a pencil. In its original form the camera lucida was extremely difficult to focus properly, and a weak spectacle lens was added between the prism and the paper. A later form, developed about 1880 for use with a microscope, substituted two diagonal mirrors for the prism; one transparent mirror was positioned above the microscope eyepiece and the second at a short distance above the paper.

Learn more about camera lucida with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for camera lucida

Few English speakers likely know this word

Word Value for camera

10
12
Scrabble Words With Friends

Quotes with camera-lucida