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megaphyll

/ˈmɛɡəfɪl/
noun
1.
(botany) the relatively large type of leaf produced by ferns and seed plants Compare microphyll
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for megaphyll
noun

a type of leaf found in ferns and seed plants, with a large complex vascular system

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megaphyll in Science
megaphyll
  (měg'ə-fĭl')   
A leaf with several or many large veins branching apart or running parallel and connected by a network of smaller veins. The fronds of ferns and the leaves of gymnosperms and angiosperms are megaphylls. Megaphylls are thought to have evolved from groups of branched stems that have become fused together. Also called macrophyll. Compare microphyll.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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