| research | (noun) systematic investigation to establish facts | - |
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| (noun) a search for knowledge | Synonyms: enquiry, inquiry |
| researcher | (noun) a scientist who devotes himself to doing research | Synonyms: investigator, research worker |
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| reseau | (noun) a network of fine lines used by astronomers as a reference for measurements on star photographs | - |
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| (noun) a net or mesh foundation for lace | - |
| resection | (noun) surgical removal of part of a structure or organ | - |
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| reseda | (noun) any plant of the genus Reseda | - |
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| resemblance | (noun) similarity in appearance or external or superficial details | - |
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| resentment | (noun) a feeling of deep and bitter anger and ill-will | Synonyms: bitterness, gall, rancor, rancour |
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| reserpine | (noun) antihypertensive consisting of an alkaloid extracted from the plant Rauwolfia serpentina (trade names Raudixin or Rau-Sed or Sandril or Serpasil) | Synonyms: Rau-Sed, Raudixin, Sandril, Serpasil |
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| reservation | (noun) the act of keeping back or setting aside for some future occasion | - |
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| (noun) the act of reserving (a place or passage) or engaging the services of (a person or group) | Synonyms: booking |
| (noun) an unstated doubt that prevents you from accepting something wholeheartedly | Synonyms: arriere pensee, mental reservation |
| (noun) something reserved in advance (as a hotel accommodation or a seat on a plane etc.) | - |
| (noun) a statement that limits or restricts some claim | Synonyms: qualification |
| (noun) the written record or promise of an arrangement by which accommodations are secured in advance | - |
| (noun) a district that is reserved for particular purpose | Synonyms: reserve |
| reserve | (noun) the trait of being uncommunicative; not volunteering anything more than necessary | Synonyms: reticence, taciturnity |
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| (noun) formality and propriety of manner | Synonyms: modesty |
| (noun) armed forces that are not on active duty but can be called in an emergency | Synonyms: military reserve |
| (noun) a district that is reserved for particular purpose | Synonyms: reservation |
| (noun) an athlete who plays only when a starter on the team is replaced | Synonyms: second-stringer, substitute |
| (noun) something kept back or saved for future use or a special purpose | Synonyms: backlog, stockpile |
| (noun) (medicine) potential capacity to respond in order to maintain vital functions | - |
| reserves | (noun) civilians trained as soldiers but not part of the regular army | Synonyms: militia |
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| reservist | (noun) a member of a military reserve | - |
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| reservoir | (noun) tank used for collecting and storing a liquid (as water or oil) | - |
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| (noun) lake used to store water for community use; a lake (natural or artificial) used to store water and used as a source of water | Synonyms: artificial lake, man-made lake |
| (noun) anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies | Synonyms: source |
| (noun) a large or extra supply of something | - |
| reset | (noun) device for resetting instruments or controls | - |
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| resettlement | (noun) the transportation of people (as a family or colony) to a new settlement (as after an upheaval of some kind) | Synonyms: relocation |
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