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in·du·si·um(ĭn-do͞o′zē-əm, -zhē-, -dyo͞o′-)
n. pl. in·du·si·a (-zē-ə, -zhē-ə)
An enclosing membrane, as that covering the sorus of a fern.
[Latin, tunic, perhaps alteration of Greek endusis, dress, from enduein, to sink into, put on : en-, in; see en-2 + duein, to sink.]
n, pl -sia (-zɪə)
1. (Botany) a membranous outgrowth on the undersurface of fern leaves that covers and protects the developing sporangia
2. (Zoology) an enveloping membrane, such as the amnion
[C18: New Latin, from Latin: tunic, from induere to put on]
in•du•si•um(ɪnˈdu zi əm, -ʒi əm, -ˈdyu-)
n., pl. -si•a (-zi ə, -ʒi ə)
1. Bot., Mycol. any of several structures having a netlike or skirtlike shape, as the membranous overgrowth covering the sori in ferns.
2. Anat., Zool.
a. an enveloping layer or membrane.
b. a thin layer of gray matter on the corpus callosum.
[1700–10; < New Latin; Latin: kind of tunic]
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|Noun||1.||indusium - a membrane enclosing and protecting the developing spores especially that covering the sori of a fern|
covering, natural covering, cover - a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover"
sorus - cluster of sporangia usually on underside of a fern frond