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English Words Starting With M

8,594 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

meter-candle
nounVery Low (Rare Technical Term)
/ˈmiːtə ˌkændl/A unit of illuminance (light intensity) equal to one lumen per square meter.
meter-candle-second
nounVery Low
/ˈmiːtə ˌkændl ˈsɛkənd/A unit of measurement for luminous energy, specifically the quantity of light received per unit area.
meterage
nounC1
/ˈmiːtərɪdʒ/The amount of something measured in meters, or the process of measuring in meters.
metered mail
nounC1
/ˈmiːtəd meɪl/Postal mail on which postage is printed directly by an approved postage meter machine, rather than using adhesive stamps.
metes and bounds
plural-nounLow / Specialized
/ˌmiːts ən ˈbaʊndz/The fixed boundaries or limits of a tract of land, as described by natural landmarks, measurements, and angles.
metestrus
nounVery Low (C2+)
/mɛtˈiːstrəs/The period of sexual quiescence following estrus (heat) in the reproductive cycle of female mammals.
metformin
nounSpecialised
/mɛtˈfɔːmɪn/An oral medication used primarily to treat type 2 diabetes by improving the body's sensitivity to insulin and reducing glucose production by the liver.
meth
nounMedium
/mɛθ/A powerful, illegal stimulant drug, specifically methamphetamine; a dangerously addictive substance.
methacetin
nounVery low
/ˌmɛθəˈsiːtɪn/A synthetic chemical compound used primarily as a substrate for the liver enzyme CYP1A2 in medical research.
methacrylate
nounTechnical
/ˌmɛθəˈkraɪleɪt/A chemical compound, specifically an ester or salt of methacrylic acid, used in the production of plastics and resins.
methacrylate resin
nounVery low (technical term)
/ˌmeθˈækrɪleɪt ˈrɛzɪn/A synthetic polymer made from methacrylic acid or its esters, used as a clear, hard, rigid plastic.
methacrylic acid
nounC2 / Specialized Technical
/ˌmɛθəˈkrɪlɪk ˈæsɪd/A colorless, corrosive liquid organic compound used primarily as an intermediate in the production of methacrylate polymers and plastics.
methadone
nounC1/C2
/ˈmeθ.ə.dəʊn/A synthetic opioid medication used to treat opioid use disorder, particularly addiction to heroin.
methaemoglobin
nounVery Low (C2+)
/mɛtˌhiːməˈɡləʊbɪn/A form of haemoglobin in which the iron is oxidised (Fe³⁺), rendering it incapable of binding oxygen.
methamphetamine
nounC1
/ˌmeθæmˈfetəmiːn/A powerful, highly addictive synthetic stimulant drug that affects the central nervous system.
methanal
nounRare / Technical
/ˈmɛθənæl/A colourless, pungent gas (CH₂O), the simplest aldehyde, used in solution as a preservative and disinfectant.
methanation
nounC2
/ˌmeθəˈneɪʃ(ə)n/The chemical process of producing methane (CH₄) from a mixture of carbon monoxide, carbon dioxide, and hydrogen.
methane
nounMedium-High (common in scientific, environmental, and energy contexts)
/ˈmiːθeɪn/A colourless, odourless flammable gas which is the main constituent of natural gas and a primary component of the Earth's atmosphere; chemical formula CH₄.
methane series
nounVery Low / Technical
/ˈmiːθeɪn ˈsɪəriːz/A homologous series of saturated hydrocarbons with the general formula CₙH₂ₙ₊₂, also known as alkanes or paraffins, where methane is the simplest member.
methanogen
nounLow
/ˈmiːθənə(ʊ)dʒən/A microorganism that produces methane gas as a metabolic by-product in anaerobic conditions.

Showing 4261–4280 of 8594 words.