stem
n.— «Some people of color prefer the word “stud” to “butch,” meaning a masculine-identified lesbian. Which makes someone who falls between a stud and a femme—a more “feminine” lesbian—a “stem.”» —“Nuances of gay identities reflected in new language ” by Rona Marech San Francisco Chronicle (California) Feb. 8, 2004. (source: Double-Tongued Dictionary)