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indusium

[in-doo-zee-uh m, -zhee-uh m, -dyoo-] /ɪnˈdu zi əm, -ʒi əm, -ˈdyu-/
noun, plural indusia
[in-doo-zee-uh, -zhee-uh, -dyoo-] /ɪnˈdu zi ə, -ʒi ə, -ˈdyu-/ (Show IPA)
1.
Botany, Mycology. any of several structures having a netlike or skirtlike shape, as the membranous overgrowth covering the sori in ferns.
2.
Anatomy, Zoology.
  1. an enveloping layer or membrane.
  2. a thin layer of gray matter on the corpus callosum.
Origin
1700-1710
1700-10; < Neo-Latin; Latin: kind of tunic, perhaps < Greek éndys(is) dressing, dress (endý(ein) to put on + -sis -sis) + Latin -ium, for Greek -ion noun suffix
Related forms
indusial, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for indusia

indusium

/ɪnˈdjuːzɪəm/
noun (pl) -sia (-zɪə)
1.
a membranous outgrowth on the undersurface of fern leaves that covers and protects the developing sporangia
2.
an enveloping membrane, such as the amnion
Derived Forms
indusial, adjective
Word Origin
C18: New Latin, from Latin: tunic, from induere to put on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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indusia in Science
indusium
  (ĭn-d'zē-əm, -zhē-)   
Plural indusia
  1. A thin membrane covering the sorus of a fern. The indusium often shrivels away when spores are ready to be dispersed. Also called fruitcover.

  2. A cuplike structure fringed with hairs and located at the top of the style in flowers of the family Goodeniaceae (which includes the garden flowers lobelia and scaevola). Pollen is deposited into the indusium by the anthers of the same flower and, as the style grows, carried up for dispersal by pollinating insects.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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