astrosphere
American Heritage Dictionary:
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as·tro·sphere
(ăs'trō-sfîr') 
n.
n.
- The central portion of a cell aster exclusive of the rays.
- The entire cell aster with the exception of the centrosome.
American Heritage Stedman's Medical Dictionary:
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as·tro·sphere
(ăs'trō-sfēr')
n.
n.
A set of radiating fibrils extending outward from the centrosome and centrosphere of a dividing cell. Also called aster, attraction sphere.
Saunders Veterinary Dictionary:
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astrosphere
1. the central mass of an aster, excluding the rays.
2. aster.
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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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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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