"a decomposing agent," 1821, agent noun from decompose.
Entries linking to decomposer
decompose v.
1750s, "to separate into components," from de- "opposite of" + compose (v.) in the sense of "make or form by uniting two or more things." Sense of "putrefy, become resolved into constituent elements" is by 1777. Related: Decomposed; decomposing.