/
ˈfɪləm(ə)nt/
n.
   - a slender thread-like object or fibre, especially one found in animal or plant structures.
 - a metal wire in an electric light bulb, made incandescent by an electric current.
 - Botany  the slender part of a stamen that supports the anther.
 
Derivative
- filamentary adj.
  - filamented adj.
  - filamentous adj.
 
Etymology
C16: from Fr., or from mod. L. filamentum, from late L. filare ‘to spin’.