Real Dictionary

mold in American English 1
a pattern, hollow form, or matrix for giving a certain shape to something in a plastic or molten state
noun: a hollow form or matrix for giving a particular shape to something in a molten or plastic state
transitive verb: to work into a required shape or form; shape

mold in American English 2
a downy or furry growth on the surface of organic matter, caused by fungi, esp. in the presence of dampness or decay
to become or cause to become overgrown or covered with mold
to make or become moldy
noun: a growth of minute fungi forming on vegetable or animal matter, commonly as a downy or furry coating, and associated with decay or dampness

mold in American English 3
loose, soft, easily worked soil, esp. when rich with decayed animal or vegetable matter and good for growing plants
noun: loose, friable earth, esp. when rich in organic matter and favorable to the growth of plants