mold 2 
(mōld)
(mōld)n.
1.
a. Any of various filamentous fungi that grow on and contribute to the decay of organic matter.
b. A growth of such fungi.
2. Any of various other saprophytic or parasitic organisms that resemble fungi, such as slime molds or water molds.
intr.v. mold·ed, mold·ing, molds
To become moldy.
[Middle English moulde, probably from past participle of moulen, to grow moldy, from Old Norse mygla.]
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