isidium

  

i·sid·i·um

[ahy-sid-ee-uhm]
noun, plural i·sid·i·a [ahy-sid-ee-uh] . Botany.
a coralloid outgrowth from the thallus in certain lichens.
Origin:
1865–70; < Neo-Latin, derivative of Isid- (stem of Isis) Isis (from the hornlike appearance of the growth); see -ium

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a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
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