Inwall \In*wall"\, v. t. [imp. & p. p. Inwalled; p. pr. & vb. n. Inwalling.] To inclose or fortify as with a wall. --Spenser.
Source: Webster's Revised Unabridged Dictionary (1913)
Inwall \In"wall`\, n. An inner wall; specifically (Metal.), the inner wall, or lining, of a blast furnace.