狐 is a bound morpheme (b.f.) meaning 'fox'. It cannot stand alone as a word in modern Chinese; it always appears as part of a compound, most commonly 狐狸 (fox). Other compounds include 狐疑 (suspicious, lit. 'fox doubt') and 狐臭 (body odor, lit. 'fox stink'). You'll also encounter it in the chengyu 狐假虎威 (to bully people by using someone else's power).