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English Words Starting With A

8,734 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)

ammonium phosphate
nounLow
/əˌməʊ.ni.əm ˈfɒs.feɪt/A salt containing ammonium and phosphate ions, commonly used as a fertilizer.
ammonium purpurate
nounVery Low
/əˈməʊ.ni.əm ˈpɜː.pjʊə.reɪt/A chemical salt, specifically the ammonium salt of purpuric acid.
ammonium salt
nounC1
/əˈməʊ.ni.əm sɒlt/A chemical compound formed by the reaction of ammonia with an acid, containing the NH₄⁺ cation.
ammonium selenate
nounC2
/əˈməʊniəm ˈsɛlɪneɪt/A chemical compound with the formula (NH₄)₂SeO₄, consisting of ammonium cations and selenate anions, commonly used as a source of selenium in fertilizers and some industrial processes.
ammonium stearate
nounC2/Technical
/əˈməʊ.ni.əm ˈstɪə.reɪt/The ammonium salt of stearic acid, a white solid commonly used as a surfactant, emulsifier, and thickener in cosmetics, pharmaceuticals, and industrial applications.
ammonium sulfate
nounLow
/əˈməʊniəm ˈsʌlfeɪt/An inorganic salt with the chemical formula (NH₄)₂SO₄, produced by reacting ammonia with sulfuric acid.
ammonium sulphate
nounLow
/əˌməʊ.ni.əm ˈsʌl.feɪt/A white crystalline salt with the chemical formula (NH₄)₂SO₄, used primarily as a fertilizer.
ammonium thiocyanate
nounC2 / Very Low Frequency (Specialized Technical)
/əˈməʊ.ni.əm ˌθaɪ.əʊˈsaɪ.ə.neɪt/An inorganic chemical compound with the formula NH₄SCN, composed of ammonium cations (NH₄⁺) and thiocyanate anions (SCN⁻).
ammonium thiosulfate
nounRare
/əˌməʊniəm ˌθaɪəʊˈsʌlfeɪt/An inorganic chemical compound with the formula (NH4)2S2O3, composed of ammonium cations and thiosulfate anions, typically appearing as a white, water-soluble crystalline solid.
ammonoid
nounC2
/ˈæmənɔɪd/An extinct marine cephalopod mollusc with a flat-coiled spiral shell, typically fossilised.
ammonolysis
nounVery Low
/ˌæməˈnɒlɪsɪs/A chemical decomposition reaction in which a compound is broken down by reaction with ammonia.
ammonolyze
verb-intransitiveverb-transitiveVery Low
/əˈmɒnəlaɪz/To subject (a compound) to decomposition or reaction with ammonia.
ammons
nounLow
ˈæmənzA plural noun referring to multiple ammonites, the extinct marine molluscs with coiled shells, commonly found as fossils.
ammunition
nounB2
/ˌæm.jəˈnɪʃ.ən/Material (such as bullets, shells, grenades) fired from weapons.
amne machin shan
nounExtremely rare / Obscure
/ˌæm.neɪ məˈʃiːn ʃæn/A phrase of mysterious origin and unclear denotation, typically presented as a verbal puzzle or linguistic curiosity.
amnesia
nounC1
/æmˈniːziə/A medical condition where a person loses memories, such as facts, information, or experiences.
amnesiac
adjectivenounLow
/æmˈniːziæk/A person suffering from amnesia, a condition involving partial or total memory loss.
amnesty
nounverbverb-transitiveC1
/ˈæmnəsti/An official pardon, especially for political offences, granted by a state authority.
amnesty international
nounC2
/ˌæm.nə.sti ˌɪn.təˈnæʃ.ən.əl/A global non-governmental organization focused on human rights, campaigning to end abuses of human rights worldwide.
amnio
nounLow (used in specific medical/informal contexts)
/ˈæm.ni.əʊ/An informal, clipped form of 'amniocentesis' – a prenatal medical procedure where a small amount of amniotic fluid is sampled.

Showing 4141–4160 of 8734 words.