defeminize
verb
de·fem·i·nize (ˌ)dē-ˈfe-mə-ˌnīz 
defeminized; defeminizing; defeminizes
transitive verb
: to divest of feminine qualities or characteristics : masculinize
defeminization
(ˌ)dē-ˌfe-mə-nə-ˈzā-shən
noun 
Word History
First Known Use
1760, in the meaning defined above
Medical Definition
defeminize
transitive verb
de·fem·i·nize
variants or British defeminise
(ˈ)dē-ˈfem-ə-ˌnīz
defeminized or British defeminised; defeminizing or British defeminising
: to divest of feminine qualities or physical characteristics : masculinize