† mortmainern.
Origin: Formed within English, by derivation. Etymons: mortmain n., mortmain v., -er suffix1.
Etymology: < mortmain n. or mortmain v. + -er suffix1.
Obsolete.
1808 J. W. Croker 40 One-third of them [sc. clergy] are not resident–absentees from their duties–mortmainers upon the land!
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online September 2019).