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free central placentation

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free central placentation  
n.   Botany
The arrangement of ovules on a central column that is not connected to the ovary wall by partitions, as in the ovaries of the carnation and primrose.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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free central placentation

noun
where ovules develop on a central column in a compound ovary lacking septa or with septa at base only 
WordNet® 3.0, © 2006 by Princeton University.
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