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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)

megafauna
nounLow
/ˈmeɡəˌfɔːnə/The large animals of a particular region, habitat, or geological period.
megaflop
nounLow
/ˈmɛɡəflɒp/A unit of computing speed equal to one million floating-point operations per second.
megaflops
nounVery Low (C2)
/ˈmɛɡəflɒps/A unit of computing speed equal to one million floating-point operations per second.
megagamete
nounVery low (C2+)
/ˈmɛɡəˌɡæmiːt/The larger, typically stationary female gamete in anisogamous reproduction; an egg cell or ovum.
megagametophyte
nounVery low
/ˌmɛɡəɡəˈmiːtə(ʊ)faɪt/The female gametophyte in plants, which develops from a megaspore and produces egg cells.
megahertz
nounLow
/ˈmɛɡəhɜːts/A unit of frequency equal to one million cycles per second, used to measure radio waves, computing clock speeds, and electromagnetic signals.
megahit
nounC1
/ˈmeɡəhɪt/An extremely successful and popular product, especially in entertainment (film, song, game).
megajoule
nounC2
/ˈmɛɡədʒuːl/A unit of energy in the International System of Units (SI), equal to one million joules.
megakaryoblast
nounVery Low
/ˌmɛɡəˈkærɪə(ʊ)blɑːst/The earliest, immature precursor cell in the bone marrow that develops into a megakaryocyte, which produces blood platelets.
megakaryocyte
nounVery Low
/ˌmɛɡəˈkarɪə(ʊ)sʌɪt/A large bone marrow cell with a lobulated nucleus, responsible for producing blood platelets.
megalesia
nounVery Low
/ˌmɛɡəˈliːzɪə/An ancient Roman festival in honor of the goddess Cybele (Magna Mater), celebrated in April with games and theatrical performances.
megalith
nounC1
/ˈmeɡ.ə.lɪθ/A very large, often undressed stone, typically from prehistoric times, used in construction or set up as a monument.
megalithic tomb
nounLow
/ˌmeɡ.əˈlɪθ.ɪk tuːm/A prehistoric burial chamber constructed from very large stones, typically dating to the Neolithic or Bronze Age.
megalitre
nounC1
/ˈmɛɡəˌliːtə/A unit of volume equal to one million litres.
megaloblast
nounVery Low / Technical
/ˈmɛɡ(ə)lə(ʊ)blɑːst/An abnormally large, immature red blood cell precursor with a large nucleus, characteristic of certain anemias, especially those caused by vitamin B12 or folate deficiency.
megaloblastic anaemia
nounC2
/ˌmɛɡələʊˈblæstɪk əˈniːmiə/A type of anaemia characterised by the presence of abnormally large, nucleated red blood cell precursors (megaloblasts) in the bone marrow.
megalocardia
nounVery Low
/ˌmɛɡələʊˈkɑːdɪə/a medical condition characterized by an abnormally large heart.
megalocephaly
nounVery Low
/ˌmɛɡələʊˈsɛfəli/An abnormal enlargement of the head.
megalomania
nounC1
/ˌmeɡələ(ʊ)ˈmeɪnɪə/A mental illness or condition characterized by delusions of grandeur, power, wealth, or omnipotence.
megalomaniac
adjectivenounC1
/ˌmɛɡələʊˈmeɪnɪæk/A person with an obsessive desire for power and influence, often combined with delusions of their own greatness or importance.

Showing 3321–3340 of 8594 words.