aecidium

[ee-sid-ee-uh m]
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.

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