The Collaborative International Dictionary of English v.0.48:
Loam \Loam\ (l[=o]m), n. [AS. l[=a]m; akin to D. leem, G. lehm,
and E. lime. See 4th Lime.]
1. A kind of soil; an earthy mixture of clay and sand, with
organic matter to which its fertility is chiefly due.
We wash a wall of loam; we labor in vain. --Hooker.
2. (Founding) A mixture of sand, clay, and other materials,
used in making molds for large castings, often without a
Loam mold (Founding), a mold made with loam. See Loam,
Loam molding, the process or business of making loam molds.
Loam plate, an iron plate upon which a section of a loam
mold rests, or from which it is suspended.
Loam work, loam molding or loam molds.