A pilus (Latin; plural : pili) is a hairlike structure on the surface of a cell, especially Gram-negative bacteria, a protein appendage required for bacterial conjugation. Pili connect the bacterium to another of its species and build a bridge between the cytoplasm of either cell. That enables the transfer of plasmids between the bacteria. An exchanged plasmid can add new functions to a bacterium, e.g., an antibiotic resistance.

Sometimes called a sex pilus (plural: sex pili). Up to ten of these structures can exist on the bacteria. Some bacterial viruses or bacteriphages attach to receptors on sex pili at the start of their reproductive cycle.

Despite the name "sex pilus", this has nothing to do with sexual reproduction or mating, nor is it the bacterial equivalent of a penis; such misnomers are used quite frequently in describing the process, and while may prove useful in understanding underlying concepts are misleading nonetheless.

A pilus is typically 9 to 10 nm in diameter. The sex pilus allows for the transfer of bacterial DNA from the bacteria with the pilus (donor) to the recipient bacteria. Through this mechanism of genetic transformation, advantageous genetic traits can be disseminated amongst a population of bacteria. Not all bacteria have the ability to create sex pili, however sex pili can form between bacteria of different species.

It is an extension of the cytoplasm and used for attachment to surfaces (and is then called a fimbrium) and conjugation with another cell of the same species.

Basically... a bacteria's dick.
Source: www.Wikipedia.org

Your dick is the size of a pili.
by Motherfucker343859243534 September 27, 2005
a sexy girl who likes to have fun and will dance until she drops.  extremely lovable, caring, and selfless.  loves her friends and loves being in the spotlight.  listens to all kinds of music and will always speak her mind.  never backs down from a dare and is a very great friend.  super hot and sexy. 
I love Pili. She's the best girlfriend ever.
by shootsdenbuu August 29, 2008

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×