"pilus." YourDictionary, n.d. Web. 26 September 2018. <http://www.yourdictionary.com/pilus>.
pilus. (n.d.). Retrieved September 26th, 2018, from http://www.yourdictionary.com/pilus
A hair or hairlike structure, especially a proteinaceous structure projecting from the surface of a bacterium that is smaller than a flagellum and functions in DNA transfer during conjugation and, usually with other such structures, in adhesion.