Latin word tribulum comes from Latin -bulum, Latin tero (I rub or triturate. I tread. I wear away or wear out.)
-bulum (Latin)
Noun suffix denoting instrument.. Noun suffix denoting person. (rare). Noun suffix denoting vessel or place.
tero (Latin)
I rub or triturate. I tread. I wear away or wear out.
tribulum (Latin)
A threshing board.