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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)

mercury chloride
nounC2
/ˈmɜː.kjə.ri ˈklɔː.raɪd/A chemical compound consisting of mercury and chlorine, existing in two main forms: mercurous chloride (Hg₂Cl₂) and mercuric chloride (HgCl₂).
mercury fulminate
nounVery Low
/ˈmɜːrkjəri ˈfʊlmɪneɪt/A highly explosive primary explosive compound with the chemical formula Hg(CNO)₂, historically used in detonators and percussion caps.
mercury mass
nounC1+
/ˈmɜː.kjə.ri mæs/A unit of mass in astronomy, used as a standard measure for comparing the masses of other celestial bodies, based on the mass of the planet Mercury.
mercury switch
nounC1
/ˈmɜː.kjə.ri ˌswɪtʃ/A switch that opens and closes an electric circuit by tilting a small container of mercury, causing the liquid metal to flow and make or break contact.
mercury-vapor lamp
nounLow frequency (technical domain)
/ˈmɜː.kjə.ri ˌveɪ.pə læmp/A gas-discharge lamp that produces light by passing an electric current through vaporized mercury.
mercury-vapour lamp
nounC2 / Rare / Technical
/ˈmɜː.kjə.ri ˌveɪ.pə ˌlæmp/A type of electric lamp that produces light by passing an electric current through mercury vapour, emitting a bright bluish-white light.
mercy
nounB2
/ˈmɜː.si/Compassion or forgiveness shown towards someone whom it is within one's power to punish or harm; forbearance from exercising a right to impose a penalty.
mercy flight
nounC1
/ˈmɜːsi flaɪt/A flight undertaken to transport a person who is seriously ill, injured, or otherwise in urgent need of medical care not available locally.
mercy killing
nounC1/C2
/ˈmɜːsi ˌkɪlɪŋ/The act of killing someone (or an animal) who is suffering from an incurable disease or severe pain, in order to relieve that suffering.
mercy seat
nounLow
/ˈmɜːsi siːt/The gold lid of the Ark of the Covenant in the Hebrew Bible, regarded as the place where God's presence dwells and atonement is made.
mercy stroke
nounLow
/ˈmɜːsi ˌstrəʊk/A final, intentionally fatal blow given to a wounded, suffering, or dying person or animal to end their suffering.
merde
interjectionnounLow
/mɛəd/An exclamation expressing frustration, annoyance, or mild anger; literally, the French word for 'shit'.
meredith
nounLow
/ˈmɛr.ə.dɪθ/A traditional Welsh and English given name of Celtic origin, now used primarily as a personal name.
merengue
nounverb-intransitiveLow-medium (B2-C1), as a specific cultural term. Lower frequency for the dessert meaning outside Spanish-speaking or culinary contexts.
/məˈreŋɡeɪ/A lively, rhythmic dance and music genre originating from the Dominican Republic, characterized by a fast-paced 2/4 beat.
mereology
nounC2
/ˌmɛrɪˈɒlədʒi/The philosophical or formal study of parts and the relationships between parts and wholes.
merese
nounExtremely rare/obsolete
/mɪˈriːz/A flat, circular disc or collar, typically of glass, used in scientific instruments (especially barometers) to separate the glass tube from the cistern or to support the tube.
merganser
nounLow frequency (C2/professional)
/mɜːˈɡænsə/A fish-eating diving duck with a slender, serrated beak.
merge
verbverb-intransitiveverb-transitiveC1
/mɜːdʒ/To combine or unite two or more things into a single entity, losing their separate identities.
mergee
nounLow/C2
/mɜːˈdʒiː/A person or entity that is taken over, absorbed, or acquired in a merger.
mergenthaler
nounVery low / Obsolete
/ˌmɜːɡənˈtɑːlə/A proprietary name or brand name historically used for specific machines, most notably the Linotype typesetting machine invented by Ottmar Mergenthaler.

Showing 3841–3860 of 8594 words.