1. Threadlike in structure. SYN: filiform (1). 2. Composed of filaments or threadlike structures. SYN: filaceous, filar (2).
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fil·a·men·tous (fil″ə-menґtəs) 1. pertaining to or composed of filaments; called also filaceous and filar. 2. composed of long, threadlike structures; said of bacterial colonies.Medical dictionary. 2011.