catechize
Concise Oxford English Dictionary © 2008 Oxford University Press:
catechize /ˈkatɪkʌɪz/ (or catechise)
▶verb instruct by means of question and answer, especially by using a catechism.
– derivatives
catechizer noun.
catechizer noun.
– origin ME: via late L. from eccles. Gk katēkhizein, from katēkhein ‘instruct orally, make hear’.
'catechize' also found in these Oxford entries:

