aster

(redirected from Michaelmas daisy)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

aster

 [as´ter]
a structure occurring in dividing cells, composed of microtubules radiating from a centrosome. The two asters are the poles of the spindle apparatus.
 Asters separating in prophase of mitosis. From Dorland's, 2000.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

as·tro·sphere

(as'trō-sfēr),
A set of radiating microtubules extending outward from the cytocentrum and centrosphere of a dividing cell.
[G. astron, star, + sphaira, ball]
Farlex Partner Medical Dictionary © Farlex 2012

aster

(ăs′tər)
n.
Biology A star-shaped structure formed in the cytoplasm of an animal cell during mitosis, having raylike microtubules that surround the centrosome.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

as·tro·sphere

(as'trō-sfēr)
A set of radiating microtubules extending outward from the cytocentrum and centrosphere of a dividing cell.
Synonym(s): aster, attraction sphere.
[G. astron, star, + sphaira, ball]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Asterclick for a larger image
Fig. 54 Aster . Generalized form.

aster

a group of blind-ending SPINDLE MICROTUBULES radiating out from the CENTRIOLES of dividing cells in lower plants and all animals. The aster function is uncertain, but does not seem to be concerned with spindle formation.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
ASTER monch is the best blue Michaelmas daisy. It has long-lasting flowers with orange centres that appear when the days shorten.
Those to leave tend to be late-flowering kinds, including agapanthus, asters the Michaelmas daisy types, chrysanthemums, delphiniums, day lilies and hostas.
Byline: The Journal's environment editor, a man who knows his mimulus from his Michaelmas daisy.
There are also dwarf, spreading forms for the rockery and Michaelmas daisy types for the herbaceous border.
Borage, Lobelia, Viola, Salvia Patens, Nigella, Ageratum, Nemophila, Centaurea, Brachycome, Felicia, Anchusa, Delphinium, Geranium, Gentian, Michaelmas Daisy. BULBS: Agapanthus, Allium.