Where does “thurrok” come from?

thurrok (Middle English) comes from Old English þurruc, from Proto-West Germanic *þurruk.

Ancestry of “thurrok”, step by step

Step	Language	Word	Meaning
1	Old English	þurruc	a small boat, the hold of a ship, drain
2	Proto-West Germanic	*þurruk	—

thurrok — Etymology, Origin & Word History | Etymology Explorer