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The Collaborative International Dictionary
Decompounding

Decompound \De`com*pound"\, v. t. [imp. & p. p. Decompounded; p. pr. & vb. n. Decompounding.] [Pref. de- (intens. in sense 1) + compound, v. t.]

  1. To compound or mix with that is already compound; to compound a second time.

  2. To reduce to constituent parts; to decompose.

    It divides and decompounds objects into . . . parts.
    --Hazlitt.

Wiktionary
decompounding

vb. (present participle of decompound English)