Browse by letter

English Words Starting With M

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

Filter

Parts of speech

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

mesocecum
nounVery Low
/ˌmɛsəʊˈsiːkəm/The mesentery of the cecum; the fold of peritoneum that attaches the cecum to the posterior abdominal wall.
mesocephalic
adjectivenounVery Low
/ˌmɛsə(ʊ)sɪˈfælɪk/Having a head of medium width or length; intermediate between dolichocephalic (long-headed) and brachycephalic (short-headed).
mesocolon
nounVery Rare / Technical
/ˌmɛsə(ʊ)ˈkəʊlɒn/The part of the peritoneum (abdominal membrane) that attaches the colon to the posterior abdominal wall.
mesocosm
nounC1+
/ˈmɛzə(ʊ)ˌkɒzəm/An enclosed, artificially controlled experimental environment that bridges the gap between a laboratory microcosm and the full-scale natural world.
mesocyclone
nounVery Low
/ˈmɛzəʊˌsaɪkləʊn/A rotating updraft within a severe thunderstorm, typically 3–10 km in diameter, that can produce tornadoes.
mesoderm
nounC2
/ˈmɛsəʊdɜːm/The middle layer of cells in an early embryo that develops into muscle, bone, connective tissue, and other structures.
mesodontism
nounExtremely Rare / Technical
/ˈmɛsə(ʊ)ˌdɒntɪz(ə)m/The condition of having teeth of medium size, particularly in relation to jaw size.
mesogastrium
nounVery Low (Specialised Terminology)
/ˌmɛsəʊˈɡæstrɪəm/The middle region of the abdomen.
mesoglea
nounVery Low (Scientific)
/ˌmɛsə(ʊ)ˈɡliːə/The gelatinous, non-living layer between the outer epidermis and inner gastrodermis in cnidarians (like jellyfish) and ctenophores.
mesolect
nounC2
/ˈmɛzə(ʊ)lɛkt/A variety of a language, particularly a creole, that is intermediate between the most prestigious (acrolect) and the most colloquial (basilect) forms.
mesolite
nounC2
/ˈmɛzəlaɪt/A hydrated sodium calcium aluminosilicate mineral belonging to the zeolite group.
mesolithic
adjectivenounLow
/ˌmɛsə(ʊ)ˈlɪθɪk/Relating to the middle part of the Stone Age, between the Palaeolithic and Neolithic periods.
mesolonghi
nounVery Low
/ˌmɛsəˈlɒŋɡi/A city in western Greece, historically significant in the Greek War of Independence.
mesolongion
nounVery Low
/ˌmɛsəˈlɒŋɡɪɒn/A town in western Greece, known historically as the site of the Siege of Mesolongion during the Greek War of Independence.
mesomere
nounVery Low
/ˈmɛzə(ʊ)mɪə/A biological term for a middle segment or part, especially in embryology (a middle layer cell) or chemistry (a mesomeric form).
mesomerism
nounLow / Very Technical
/mɪˈzɒmərɪz(ə)m/The phenomenon in chemistry where the true structure of a molecule is represented as a weighted average (resonance hybrid) of two or more contributing structures (resonance structures), due to the delocalization of electrons.
mesometeorology
nounVery Low / Technical
/ˌmɛsəʊˌmiːtɪəˈrɒlədʒi/, /ˌmɛzəʊ-/The scientific study of atmospheric phenomena that are intermediate in scale between micrometeorology (very local) and synoptic meteorology (large-scale weather systems). It typically focuses on weather events with horizontal scales of a few kilometres to several hundred kilometres.
mesomorph
nounC1
/ˈmɛsə(ʊ)mɔːf/A person with a muscular, athletic body type characterized by a robust bone structure and well-developed muscles.
meson
nounVery Low Frequency (Technical/Specialist)
/ˈmiːzɒn/A subatomic particle of intermediate mass, composed of a quark and an antiquark, responsible for mediating the strong nuclear force.
mesonephros
nounRare
/ˌmɛsəʊˈnɛfrɒs/The temporary kidney of embryonic amniotes (reptiles, birds, mammals), which functions during fetal development.

Showing 4001–4020 of 8594 words.