British spelling: a person who catechises; someone who instructs others in religious doctrine through systematic questions and answers.
From 'catechise' + '-er' suffix (agent noun indicating someone who performs the action). This British form parallels the American 'catechizer,' both following standard English word-formation patterns.
A catechiser was essentially a religious educator with specialized skills—they had to know their theology inside-out to field every possible question from students being drilled on doctrine.
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