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aecidium

[ee-sid-ee-uhm]

noun, plural ae·cid·i·a

[ee-sid-ee-uh] . Mycology.

an aecium in which the spores are always formed in chains and enclosed in a cup-shaped peridium.

Origin:
1865–70; < Neo-Latin; see aecium, -idium

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Aecidium is always a great word to know.

So is ninnyhammer. Does it mean:

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

a fool or simpleton; ninny.

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Collins

World English Dictionary

aecium or aecidium (ˈiːsɪəm, iːˈsɪdɪəm)

—n , pl -cia, -cidia
	a globular or cup-shaped structure in some rust fungi in which aeciospores are produced

[C19: New Latin, from Greek aikia injury (so called because of the damage the fungi cause)]

aecidium or aecidium (ˈiːsɪəm, iːˈsɪdɪəm, -sɪə, -ˈsɪdɪə)

—n

[C19: New Latin, from Greek aikia injury (so called because of the damage the fungi cause)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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aecidium

ae·cid·i·um