Where does “katechismus” come from?

katechismus (Czech) comes from Late Latin catechismus, from Ancient Greek κατηχισμός, from Ancient Greek κατηχίζω, from Ancient Greek κατήχησις, from Ancient Greek κατηχέω, from Ancient Greek κᾰτᾰ-, from Ancient Greek κατά, from Ancient Greek καταστερίζω — to be/become dry; to burn, to glow; hearth.

katechismus (Czech): catechism

Definitions

catechism

Ancestry of “katechismus”, step by step

Step	Language	Word	Meaning
1	Late Latin	catechismus	—
2	Ancient Greek	κατηχισμός	katēkhismos
3	Ancient Greek	κατηχίζω	I instruct orally; to catechize
4	Ancient Greek	κατήχησις	oral instruction; instruction by word of mouth
5	Ancient Greek	κατηχέω	to resound; to teach by word of mouth
6	Ancient Greek	κᾰτᾰ-	fully; down; denoting motion downwards
7	Ancient Greek	κατά
8	Ancient Greek	καταστερίζω	to place among the stars; I put among the stars
9	Ancient Greek	ἀστήρ	a celestial body; illustrious person; starfish
10	Proto-Hellenic	astḗr	star
11	Proto-Indo-European	h₂stḗr	star
12	Proto-Indo-European	h₂eHs-	to be/become dry; to burn, to glow; hearth

Every word from Proto-Indo-European h₂eHs- →

katechismus — Etymology, Origin & Word History | Etymology Explorer