asterionella
noun
as·te·ri·o·nel·la
1
capitalized
: a small genus of narrowly linear diatoms (family Fragilariaceae) arranged in stellate free-floating colonies and often causing geraniumlike or fishy odors in public water supplies
2
plural -s
: a diatom of the genus Asterionella
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Merriam-Webster unabridged
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