from The Century Dictionary.
- In botany and zoology, slender, like a thread, as the filaments of many plants and animals; filamentous; filiform: filar.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Having the form of a thread; filiform.
Sorry, no etymologies found.
Among the common forms are small, nearly globular cells; oblong, rod-shaped or thread-shaped filaments, either straight or curved, or even spirally twisted.