different between reduced vs reducer

English

(UK) IPA^(key): /???dju?st/
(US) enPR: r?-do?ost?, IPA^(key): /???dust/ or enPR: r?-djo?ost?, IPA^(key): /???djust/

reduced

reduced (comparative more reduced, superlative most reduced)

Made smaller or less; having undergone reduction.
the reduced prices in a summer sale
Discounted in price.
the reduced goods at the sale
(cooking) Of a sauce etc.: made more concentrated.
The chicken was served in a reduced red wine sauce.

reduce +? -er

reducer (plural reducers)

Something that reduces.
(chemistry) A reducing agent.
(hydraulics) A hydraulic device for reducing pressure and hence increasing movement, used to transmit the load from the hydraulic support of the lower shackle to the lever weighing apparatus in some kinds of heavy testing machine.
(photography) A liquid used in the process of developing a negative to reduce its darkness.
(plumbing) A component used to connect two pipes of different bores.
(software) A function that takes state and action as arguments and returns the next state of the app.

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