Early 17th century; earliest use found in William Vaughan (c1575–1641), writer and promoter of colonization in Newfoundland. From post-classical Latin monitrix, feminine form corresponding to classical Latin monitor: see -trix.
Definition of monitrix in US English:
monitrix
nounˈmɒnɪtrɪks
rare
A female guide or mentor; = monitress.
Origin
Early 17th century; earliest use found in William Vaughan (c1575–1641), writer and promoter of colonization in Newfoundland. From post-classical Latin monitrix, feminine form corresponding to classical Latin monitor: see -trix.