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isidium

[ahy-sid-ee-uh m]
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noun, plural i·sid·i·a [ahy-sid-ee-uh] /aɪˈsɪd i ə/. Botany.
  1. a coralloid outgrowth from the thallus in certain lichens.

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. 2018