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isidium

[ ahy-sid-ee-uhm ]
/ aɪˈsɪd i əm /
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noun, plural i·sid·i·a [ahy-sid-ee-uh]. /aɪˈsɪd i ə/. Botany.
a coralloid outgrowth from the thallus in certain lichens.
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Origin of isidium

1865–70; <New Latin, derivative of Isid- (stem of Isis) Isis (from the hornlike appearance of the growth); see -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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