1. Hairlike structure especially on the surface of a cell or microorganism
   "The bacteria's pili allow it to attach to host cells"
    
2. Any of the cylindrical filaments characteristically growing from the epidermis of a mammal
   "Each pilus contains keratin proteins";
   - hair

Sounds like: pilot, P, pilus

Derived forms: pili

Type of: filament, filum, hair

Part of: mammal, mammalian, microorganism

Encyclopedia: Pilus