What is the form of the word fellow describing a female?

Answer 1

there isn't one. "fellow" is male or female.

Main Entry: fellow Part of Speech: nounDefinition: male or female colleague, friend Antonyms: enemy

http://thesaurus.reference.com/browse/fellow

Fellow can mean a colleague, but the outdated usage refers to a male of low status, the female equivalent is wench.

You will still hear certain groups of people use this archaic term. For example in rap, they refer to boys as "fellas" and girls as "bitches", which replaces wenches.

Answer 2

The term "fellow" typically has a gender-neutral form and can be used to describe both males and females. If you specifically wanted to address a female, you could use "fellow" as a gender-neutral term or consider using alternatives like "colleague," "associate," or "companion" for female-specific references.