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sphere

 [sfēr]
a three dimensional round body; called also globus. adj., adj spher´ical.
attraction sphere centrosome.
segmentation sphere
1. morula.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

sphere

(sfēr),
A ball or globular body.
[G. sphaira]
Farlex Partner Medical Dictionary © Farlex 2012

sphere

(sfēr)
A ball or globular body.
[G. sphaira]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

sphere 

A term commonly used to denote the spherical component of a prescription or of the power of a lens, or even a spherical lens. See spherical lens; prescription.
far point sphere The imaginary spherical surface on which lie the far points of accommodation for all directions of gaze. See far point of accommodation.
near point s . The imaginary spherical surface on which lie the near points of accommodation for all directions of gaze. See near point of accommodation.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann