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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Xan·thid·i·um n.; pl. Xanthidia   Bot. A genus of minute unicellular algae of the desmids. These algae have a rounded shape and are armed with glochidiate or branched aculei. Several species occur in ditches, and others are found fossil in flint or hornstone.
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