American Heritage Dictionary
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
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Elsewhere on the web
Desmids are typically one-celled, though sometimes filamentous or colonial, and are divided symmetrically into semicells connected at a central point.
The group tself is made of filamentous, unicellular protists.— CreationWiki - Recent changes [en]
Live-cell imaging techniques are now routinely used to study filamentous fungi.— CiteULike: Everyone's library
The X-ray also depicts a conifer with different leaf angles and a more filamentous appearance than the shoot in the lung tissue, Thomas said.— CBC | Top Stories News

Century Dictionary (1)
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