IPA: /ˌfɪl.əˈmɛn.təs/
KK: /ˌfɪl.əˈmen.təs/
Having the shape or appearance of thin threads or fibers.
The filamentous structure of the algae made it difficult to see in the water.
Filamentous → It is formed from "filament" (from Latin "filamentum", meaning a thread or fiber) and the suffix "-ous" (meaning full of or having the quality of). The word "filamentous" describes something that is full of or resembling threads or fibers.
Think of 'filament' as a thread and remember that 'filamentous' means full of threads or fibers.