Filamentous (adjective)

1. Having the form of or resembling a filament or thread.
2. Composed of or resembling filaments.

Origin:

Filamentous comes from the latin word "filamentum" meaning a thin thread, it was first used in the late 17th century in the field of botany and biology.

Examples:

1. The filamentous algae that covered the pond was so thick that it was impossible to see the water.
2. The filamentous fungus that was growing on the bread appeared to be harmless, but it was actually a toxic species.
3. A filamentous protozoan is a single-celled organism that has thread-like or bristle-like appendages.
4. The scientist was fascinated by the filamentous structure of the nerve cells.
5. The filamentous bacteria were found to be responsible for the clogging of the water pipe.