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[ee-sid-ee-uh m]
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noun, plural ae·cid·i·a [ee-sid-ee-uh] /iˈsɪd i ə/. Mycology.
  1. an aecium in which the spores are always formed in chains and enclosed in a cup-shaped peridium.
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Origin of aecidium

From New Latin, dating back to 1865–70; see origin at aecium, -idium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018