mater
n. countablen. an old-fashioned and slightly funny way to say 'mother'. It is mostly used by people from wealthy or upper-class backgrounds in Britain.
n. a humorous or affectionate term for one's mother. Chiefly British and associated with upper-class sociolects; often used in a self-consciously archaic or ironic manner.
I must write a letter to my dear mater this evening.
He joked that his mater would never approve of him wearing such a casual outfit to dinner.
The protagonist's frequent references to his mater and pater immediately established his posh upbringing and somewhat detached relationship with the modern world.
From Latin māter (“mother”), partly via Late Middle English matere. Doublet of mata and mother. Ancestor of matrix.
From mate + -er.
See 'mater.
Typically used with a possessive pronoun like 'my' or 'his'.