acicular
American Heritage Dictionary:
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a·cic·u·lar
(ə-sĭk'yə-lər) 
adj.
Having the shape of a needle: acicular crystals.
adj.
Having the shape of a needle: acicular crystals.
Roget's Thesaurus:
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acicular
adjective
- Having an end that tapers to a point: aciculate, aciculated, acuminate, acute, cuspate, cuspated, cuspidate, cuspidated, mucronate, pointed, pointy, sharp. See sharp/dull.
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Needlelike; refers to the growth of a mineral in long and slender crystals.
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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Peterson Field Guide to Rocks & Minerals
Peterson Field Guide to Rocks and Minerals, by Frederick H. Pough. Copyright © 1998 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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