| 单词 | iceland spar |
| 释义 | Iceland sparnouna transparent variety of calcite that is double-refracting and is used as a polarizer. Origin of Iceland sparFirst recorded in 1820–30 Words nearby Iceland sparIceland disease, Icelander, Icelandic, Iceland moss, Iceland poppy, Iceland spar, I cell, ice lolly, ice machine, ice maiden, icemaker Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for Iceland sparIceland spar nouna pure transparent variety of calcite with double-refracting crystals used in making polarizing microscopes 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 Scientific definitions for Iceland sparIceland spar [ īs′lənd ] 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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