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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)

microcephaly
nounLow
/ˌmaɪ.krəʊˈsef.əl.i/A medical condition where a baby's head is significantly smaller than expected for their age and sex, often due to abnormal brain development.
microchemistry
nounVery Low
/ˌmaɪkrəʊˈkɛmɪstri/The branch of chemistry concerned with performing chemical analysis and synthesis using very small quantities of substances, typically on a scale of milligrams or less.
microchip
nounverbB2
/ˈmaɪ.krəʊ.tʃɪp/A very small piece of semiconductor material, typically silicon, containing an integrated electronic circuit.
microciona
nounExtremely Rare
/ˌmaɪkrəʊˈsaɪənə/A genus of marine sponges, primarily found in the family Microcionidae.
microcircuit
nounLow to Mid
/ˈmaɪkrəʊˌsɜːkɪt/A miniature electronic circuit, especially an integrated circuit, containing components such as transistors, resistors, and capacitors on a tiny piece of semiconductor material.
microcircuitry
nounLow (C2)
/ˈmaɪ.krəʊˌsɜː.kɪ.tri/The tiny interconnected electronic components and circuits on a microchip.
microcirculation
nounLow (Technical)
/ˌmaɪ.krəʊ.ˌsɜː.kjʊˈleɪ.ʃən/The flow of blood through the smallest blood vessels in the body, including capillaries, arterioles, and venules.
microclimate
nounC1
/ˈmaɪ.krəʊˌklaɪ.mət/The specific climate of a small, localised area that differs from the climate of the surrounding larger area.
microclimatology
nounC2 (Very Low Frequency / Specialist Term)
/ˌmaɪkrəʊˌklaɪməˈtɒlədʒi/The scientific study of very small-scale climates and the environmental factors that create them.
microcline
nounVery low frequency
/ˈmaɪkrə(ʊ)klaɪn/A mineral, a variety of potassium feldspar, that is a common rock-forming silicate.
micrococcus
nounVery Low
/ˌmʌɪkrə(ʊ)ˈkɒkəs/A genus of spherical bacteria, typically found in pairs, tetrads, or irregular clusters.
microcode
nounLow (Specialized)
/ˈmaɪ.krəʊ.kəʊd/A low-level set of instructions that controls the operations of a computer's central processing unit (CPU).
microcomponent
nounLow
/ˌmaɪkrəʊkəmˈpəʊnənt/A very small individual part or element that makes up a larger system, especially in electronics and engineering.
microcomputer
nounLow
/ˈmaɪkrəʊkəmpjuːtə/A small digital computer containing a microprocessor as its central processing unit, designed for use by one person at a time.
microcomputing
nounC2
/ˌmaɪ.krəʊ.kəmˈpjuː.tɪŋ/The use, design, or operation of small-scale computers that utilize a microprocessor as their central processing unit.
microconstituent
nounVery low
/ˌmaɪ.krəʊ.kənˈstɪ.tʃu.ənt/A microscopic or extremely small component within a larger structure, especially in materials science, describing distinct phases or parts visible under a microscope.
microcopy
nounLow-medium (specialised term)
/ˈmaɪ.krəʊˌkɒp.i/The small pieces of text in a user interface that guide, instruct, or engage users (e.g., button labels, error messages, tooltips).
microcosm
nounC2
/ˈmaɪ.krə(ʊ)ˌkɒz.əm/A community, place, or situation regarded as encapsulating in miniature the characteristics of something much larger; a small, representative system having analogies to a larger system.
microcosmic salt
nounVery rare
/ˌmaɪkrə(ʊ)ˈkɒzmɪk sɔːlt/A specific chemical compound composed of sodium ammonium hydrogen phosphate (Na(NH₄)HPO₄·4H₂O).
microcredit
nounC1
/ˈmaɪ.krəʊˌkred.ɪt/The lending of very small sums of money at low interest to individuals, especially entrepreneurs in developing economies, to help them start or expand a small business.

Showing 4601–4620 of 8594 words.