Relating to or belonging to the family Dasycladaceae, a group of ancient green algae.
From Dasycladaceae (the algae family name) + Latin '-ous' (adjective suffix meaning 'having the quality of'). This is a scientific descriptor created for biological classification.
This word is almost never used outside of geology and paleontology labs—it's one of those ultra-specific scientific terms that describes creatures that haven't existed for millions of years!
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