Late Middle English; earliest use found in Cursor Mundi: a Northumbrian poem of the 14th century. Probably from mid + woman, after midwife. In later use probably re-formed from mid- + woman.
Definition of midwoman in US English:
midwoman
nounˈmɪdwʊmən
Southern, United States Regional rare
A midwife.
Origin
Late Middle English; earliest use found in Cursor Mundi: a Northumbrian poem of the 14th century. Probably from mid + woman, after midwife. In later use probably re-formed from mid- + woman.