Where does “trosc” come from?

trosc (Irish) comes from Middle Irish trosc, from Old Norse þorskr, from Proto-Germanic þurskaz, from Proto-Indo-European ters- — dry.

trosc (Irish): cod

Definitions

Step	Language	Word	Meaning
1	Middle Irish	trosc	—
2	Old Norse	þorskr	cod
3	Proto-Germanic	þurskaz	cod
4	Proto-Indo-European	ters-	dry

trosc — Etymology, Origin & Word History | Etymology Explorer