durc : steel
The Fennas word for steel (metal alloy) is durc. Durc is rare masculine last name. Durc is the name of Ayla's son in The Clan of the Cave Bear.
How did I come up with this word? The Welsh word for steel is dur, the Irish word for steel is cruach, and the Breton word for steel is dir.
The picture shows forged steel balls used for grinding, such as grinding ore. These balls are likely heavy.
Notice that the first three letters of my word for steel, durc, are the Welsh word for steel, and the last letter going backwards are the first three letters of the Irish word.