Browse by letter
English Words Starting With R
5,802 entries — pick a word to see its definition, pronunciation, and usage.
Filter
Parts of speech
- redstart/ˈrɛd.stɑːt/A small migratory songbird with reddish tail feathers or markings.nounLow
- redstone/ˈrɛdˌstəʊn/A type of fictional, conductive mineral or ore with luminescent red properties, central to mechanisms in the video game Minecraft.nounLow
- redtop/ˈrɛdtɒp/A type of grass, especially a bentgrass of the genus Agrostis, known for its reddish seed heads.nounC1/C2
- reduce/rɪˈdjuːs/to make something smaller in size, amount, degree, importance, or price.verbverb-intransitiveverb-transitiveB1
- reduced level/rɪˈdjuːst ˈlɛv(ə)l/A state or amount that has been made smaller, lower, or less significant.nounC1
- reduced mass/rɪˈdjuːst ˈmæs/A mathematical quantity used in physics to simplify the two-body problem, representing the effective inertial mass in a system of two interacting bodies.nounRare (except in technical physics/chemistry contexts).
- reduced paid-up insurance/rɪˈdjuːst ˈpeɪd ʌp ɪnˈʃʊərəns/A life insurance policy that continues with a lower death benefit after premium payments cease.nounlow
- reducer/rɪˈdjuːsə(r)/A person or thing that reduces something, especially in size, amount, or intensity.nounB2
- reducing agent/rɪˈdjuːsɪŋ ˌeɪdʒ(ə)nt/A substance that donates electrons or hydrogen atoms to another substance in a chemical reaction, thereby being oxidized itself.nounC1
- reducing glass/rɪˈdjuːsɪŋ ɡlɑːs/A convex lens, such as a spyglass, used in older scientific contexts to make an object appear smaller and more distant when viewed.nounExtremely Low / Obsolete
- reduct/rɪˈdʌkt/To reduce something to a simpler or more basic form.verb-transitiveLow
- reductase/rɪˈdʌkteɪz/An enzyme that catalyzes a reduction reaction, where a molecule gains electrons, often in the form of hydrogen atoms.nounC2
- reductase test/rɪˈdʌkteɪz tɛst/A laboratory procedure designed to detect the presence of reductase enzymes.nounVery Low
- reductio ad absurdum/rɪˌdʌktɪəʊ æd æbˈsɜːdəm/A method of proving a statement false by showing its logical consequences lead to a contradiction or absurd conclusion.nounLow (C2/professional)
- reduction/rɪˈdʌkʃ(ə)n/The act of making something smaller in size, amount, or degree, or the result of this process.nounB2
- reduction division/rɪˈdʌkʃn dɪˈvɪʒn/A biological process (meiosis) where a cell divides to produce gametes with half the original chromosome number.nounC2
- reduction formula/rɪˈdʌkʃən ˈfɔːmjʊlə/A mathematical formula that expresses a complex integral or expression in terms of a simpler one of the same type, typically with a reduced exponent or parameter.nounC2 (Very low frequency; highly technical)
- reduction potential/rɪˈdʌkʃən pəˌtenʃl/The measure of the tendency of a chemical species to gain electrons and be reduced.nounC1/C2
- reduction ratio/rɪˈdʌkʃən ˈreɪʃiəʊ/A quantitative measure expressing the proportional decrease in size, number, or amount of something, often represented as the ratio of an initial value to a final value.nounLow (High in specific technical fields)
- reductionism/rɪˈdʌk.ʃə.nɪ.zəm/The practice of analysing and describing a complex phenomenon in terms of its simple or fundamental constituents, especially when this is said to provide a sufficient explanation.nounC2
Showing 1861–1880 of 5802 words.