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cat·e·chist (kăt́ĭ-kĭst)

[French catechiste, from Old French, from Late Latin catēchista, from Late Greek katēkhistēs, from katēkhizein, to teach by word of mouth; see catechize.]

noun 

A person who catechizes, especially one who instructs catechumens in preparation for admission into a Christian church.

derivatives

cat́e·chiśtic
adjective