subterrene

noun

1. A machine for drilling or tunneling underground.

   rare

   With a deafening screech of metal upon rock—which surely must echo through all the recesses of the Mountain, and waken all its nightmare brood!—the subterrene smashed through the wall and came to rest beside them.

Where it comes from

From Latin subterrēnus. By surface analysis, sub- + terrene.

Adapted from the Wiktionary entry subterrene (CC BY-SA 4.0).

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