bocca means the round hole in the furnace of a glassworks through which the fused glass is taken out. Lexicurio rates it Rare gem — a strength score of 72 out of 100.
noun
- The round hole in the furnace of a glassworks through which the fused glass is taken out.“The second partition divides this from the leer or annealing furnace; through the boccas, or working holes,”