One of the mysteries of the English language finally explained.
With reference to the annulment of marriage on the grounds of the sexual impotence of the husband: in respect of this woman only.
Mid 17th century; earliest use found in Edmund Gayton (1608–1666), physician and hack writer. From post-classical Latin quo ad hanc so far as this (woman) is concerned from classical Latin quoad + hanc, accusative feminine of hīc this.
quoad hanc/ˌkwəʊad ˈhaŋk/
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