| reducer | (noun) pipefitting that joins two pipes of different diameter | - |
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| (noun) a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver | Synonyms: reducing agent, reductant |
| reducing | (noun) any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent | Synonyms: reduction |
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| (noun) loss of excess weight (as by dieting); becoming slimmer | - |
| reductant | (noun) a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver | Synonyms: reducer, reducing agent |
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| reductase | (noun) an enzyme that catalyses the biochemical reduction of some specified substance | - |
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| reductio | (noun) (reduction to the absurd) a disproof by showing that the consequences of the proposition are absurd; or a proof of a proposition by showing that its negation leads to a contradiction | Synonyms: reductio ad absurdum |
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| reduction | (noun) the act of decreasing or reducing something | Synonyms: decrease, diminution, step-down |
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| (noun) the act of reducing complexity | Synonyms: simplification |
| (noun) any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent | Synonyms: reducing |
| reductionism | (noun) a theory that all complex systems can be completely understood in terms of their components | - |
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| (noun) the analysis of complex things into simpler constituents | - |
| reductivism | (noun) an art movement in sculpture and painting that began in the 1950s and emphasized extreme simplification of form and color | Synonyms: minimal art, minimalism |
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| redundance | (noun) the attribute of being superfluous and unneeded | Synonyms: redundancy |
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| redundancy | (noun) repetition of an act needlessly | - |
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| (noun) the attribute of being superfluous and unneeded | Synonyms: redundance |
| (noun) (electronics) a system design that duplicates components to provide alternatives in case one component fails | - |
| (noun) repetition of messages to reduce the probability of errors in transmission | - |
| reduplication | (noun) the act of repeating over and again (or an instance thereof) | Synonyms: reiteration |
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| (noun) a word formed by or containing a repeated syllable or speech sound (usually at the beginning of the word) | - |
| (noun) the syllable added in a reduplicated word form | - |
| (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: anadiplosis |
| reduviid | (noun) a true bug: long-legged predacious bug living mostly on other insects; a few suck blood of mammals | Synonyms: assassin bug |
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