Might mean (unverified): Microscopic, single-celled, silica-walled algae.
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We found 2 dictionaries that define the word diatomacean:

General (2 matching dictionaries)
  1. diatomacean: Wordnik
  2. diatomacean: Wiktionary

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Definitions from Wiktionary (diatomacean)

▸ adjective:  Synonym of diatomaceous

Similar:
epipsammic, plagiogrammoid, cymbelloid, episammic, didynamian, dipteridaceous, diaporthaceous, keratinaceous, fragilariacean, centric, more...

Opposite:
non-diatomaceous, non-siliceous, non-siliceous algae

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Similar:
epipsammic, plagiogrammoid, cymbelloid, episammic, didynamian, dipteridaceous, diaporthaceous, keratinaceous, fragilariacean, centric, more...

Opposite:
non-diatomaceous, non-siliceous, non-siliceous algae



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