Xan*thid"i*um (?), n.; pl. Xanthidia (#). [NL., fr. Gr. xanthos yellow.] (Bot.)
A genus of minute unicellular algae of the desmids. These algæ 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.
© Webster 1913