Source : Webster's Revised Unabridged Dictionary (1913)

Inwall \In*wall"\, v. t. [imp. & p. p. {Inwalled}; p. pr. & vb.
   n. {Inwalling}.]
   To inclose or fortify as with a wall. --Spenser.

Inwall \In"wall`\, n.
   An inner wall; specifically (Metal.), the inner wall, or
   lining, of a blast furnace.