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favellidium
[ fav-uh-lid-ee-uhm ]
/ ˌfæv əˈlɪd i əm /
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noun, plural fav·el·lid·i·a [fav-uh-lid-ee-uh]. /ˌfæv əˈlɪd i ə/.
(in certain red algae) a cystocarp wholly or partly immersed in a frond.
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Which of the following nouns has an irregular plural form?
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022