Iceland_spar
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World English Dictionary
| Iceland spar | |
| —n | |
| a pure transparent variety of calcite with double-refracting crystals used in making polarizing microscopes | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
Iceland spar  (īs'lənd) Pronunciation Key
A form of calcite that is transparent and causes light passing through it to refract in two directions (forming a double image of an object seen through it). Iceland spar occurs in perfect rhombohedrons and is used in optical instruments. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
00:10
Iceland spar
is always a great word to know.
So is ort. Does it mean:
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a scrap or morsel of food left at a meal. |
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