noun Biology.
an unfertilized egg within an oogonium.

1870–75; oo- + -sphere

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World English Dictionary
oosphere (ˈəʊəˌsfɪə)
a large female gamete produced in the oogonia of algae and fungi

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

oosphere o·o·sphere (ō'ə-sfēr')
A large nonmotile female gamete or egg cell, formed in an oogonium and ready for fertilization.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
oosphere   (ō'ə-sfîr')  Pronunciation Key 
A large nonmotile female gamete formed in an oogonium, such as the eggs formed in the oogonium of an oomycete.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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