Noun
Possession of lands or tenements in, or conveyance to, dead hands, or hands that cannot alienate.
Source: Webster's dictionaryInanimate objects are harmless indeed, Mr. Mortmain. But one cannot always say the same of the men who use them. Cassandra Clare
I imagine that it will not be easy to persuade Mortmain into a bonnet," Magnus observed. "Though the color would be fetching on him." Henry burst into laughter. "Very droll, Mr. Bane." "Please, call me Magnus." "I shall! Cassandra Clare