inwall

[verb in-wawl; noun in-wawl]
noun
  1. an inner wall.
  2. Metallurgy. an inwardly sloping wall above the bosh of a blast furnace.

Origin of inwall

First recorded in 1605–15; in-1 + wall
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018