lactivistEnglishOxford Dictionary of Englishlactivist /ˈlaktɪvɪst / ▸ noun a person who strongly advocates, or campaigns in support of, breastfeeding (sometimes used with negative connotation, suggesting an uncompromising approach): lactivists have taken to the streets to protect the right to breastfeed in public. – ORIGIN 1990s: blend of lactation and activist.