blastodisk

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blas·to·disk

or blas·to·disc  (blăs′tə-dĭsk′)
n.
See germinal disk.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

blas•to•disk

or blas•to•disc

(ˈblæs təˌdɪsk)

n.
the blastula forming as a flattened sphere on top of the yolk in the eggs of birds and reptiles.
[1885–90]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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