Definition of indusium in English:

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Pronunciation: /inˈd(y)o͞oZHēəm/

noun (plural indusia /-ZHēə/ /-zēə/)

chiefly Botany
A thin membranous covering, especially a shield covering a sorus on a fern frond.
Example sentences
  • The leaf margins themselves are often reflexed to form false indusia that protect the sori.
  • The latter is covered by the indusium griseum, a thin sheet of rudimentary cortex containing (on each side) the delicate medial and lateral longitudinal striae.
  • The upper surface of the intermediate portion of the corpus callosum is covered by a thin veil of gray substance - the indusium griseum.


Early 18th century: from Latin, literally 'tunic', from induere 'put on, don'.

For editors and proofreaders

Syllabification: in·du·si·um

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