'Tuyere arch' definitions:

Definition of 'Tuyere arch'

From: GCIDE

Tuyere \Tu`y[`e]re"\, n. [F.; akin to tuyau a pipe; of Teutonic origin. Cf. Tweer, Tewel.] A nozzle, mouthpiece, or fixture through which the blast is delivered to the interior of a blast furnace, or to the fire of a forge. [Corruptly written also tweer, and twier.] [1913 Webster]
Tuy[`e]re arch, the embrasure, in the wall of a blast furnace through which the tuy[`e]re enters. [1913 Webster]