Tribulum.

"In several versions of the Bible, the word for suffering is translated ‘tribulation.’ This comes from the Latin word tribulum, which was taken from the name of a piece of farm equipment used during the New Testament times. A tribulum was a heavy piece of timber with spikes in it that was drawn over newly picked grain. It separated the valuable grain from the worthless chaff. Tribulation, or suffering, does the same thing to your character. It sifts it, helping you sort out what’s truly important in life from what’s of little value." - Analysis of Romans 5:3-4