تعفن

Verb

 * 1) to rot, to putrefy and decay, to moulder
 * 2)  to become infested with mold

Etymology 2
Verbal noun of, from the root , related to rotting.

Noun

 * 1) rottenness, putridity, decay, mould
 * 2) mold, mould
 * 1) mold, mould