How do you spell Loam

Available Definitions:
1)  n. - A kind of soil; an earthy mixture of clay and sand, with organic matter to which its fertility is chiefly due.
2)  n. - A mixture of sand, clay, and other materials, used in making molds for large castings, often without a pattern.
3)  v. i. - To cover, smear, or fill with loam.