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Webster's Dictionary (1865)

So-rē'di-ūm, n.

noun

n.; pl. SO-RĒ'-DI-Ā. [N. Lat., from Gr. σωρός, a heap.] (Bot.) A patch of granular bodies on

A magnified lichen surface with clusters of soredia, alongside a small inset showing a raised cluster.
Soredia.