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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)

amygdaloid
adjectivenounlow
/əˈmɪɡdəlɔɪd/Resembling or shaped like an almond; relating to the amygdala region of the brain.
amygdule
nounVery low
/əˈmɪɡdjuːl/A small, often rounded mass of mineral material filling a cavity (vesicle) in volcanic rock.
amyl
adjectivenounC2/Technical
/ˈeɪmɪl/A univalent hydrocarbon radical (C5H11) derived from pentane, used in chemistry.
amyl acetate
nounLow (Technical)
/ˌæm.ɪl ˈæs.ɪ.teɪt/A chemical ester with a strong, fruity, banana-like odour, commonly used as a flavouring agent, solvent, and perfume ingredient.
amyl alcohol
nounC2
/ˌæmɪl ˈælkəhɒl/Any of eight isomeric alcohols with the formula C5H11OH, a colourless liquid with a characteristic odour.
amyl group
nounVery Low
/ˈæm.ɪl ɡruːp/The univalent alkyl radical C₅H₁₁– derived from pentane.
amyl nitrite
nounLow frequency / Specialist
/ˌæmɪl ˈnaɪtraɪt/A volatile, yellow liquid organic compound, used medically as a vasodilator to relieve chest pain (angina).
amyl propionate
nounVery Low (Technical)
/ˌeɪ.mɪl ˈprəʊ.pi.ə.neɪt/A chemical compound, specifically an ester formed from amyl alcohol and propionic acid, used as a solvent and flavoring agent.
amylase
nounLow
/ˈæm.ɪ.leɪz/An enzyme that breaks down starch and glycogen into sugars like maltose.
amylene
nounExtremely Rare
/ˈæmɪliːn/A colorless, flammable, liquid hydrocarbon (C5H10), specifically one of the pentenes, used as an anesthetic and solvent.
amylogen
nounExtremely Rare/Obsolete
/ˈæmɪlə(ʊ)dʒɛn/A substance derived from starch, specifically the soluble portion of starch formed during hydrolysis.
amyloid
adjectivenounLow
/ˈæmɪlɔɪd/A type of abnormal protein that forms fibrils, which can accumulate in tissues and organs.
amyloidosis
nounC2
/ˌæmɪlɔɪˈdəʊsɪs/A medical condition characterised by the abnormal deposition of amyloid protein in tissues and organs.
amylolysis
nounLow
/ˌæmɪˈlɒlɪsɪs/The process of breaking down starch into simpler sugars, such as maltose or glucose.
amylopectin
nounC2
/ˌæmɪləʊˈpektɪn/The major component of starch, consisting of a highly branched polymer of glucose units.
amyloplast
nounVery Low
/ˈamɪlə(ʊ)plast/A colourless organelle found in plant cells that stores and synthesises starch.
amylopsin
nounVery Low
/ˌæmɪˈlɒpsɪn/The starch-digesting enzyme found in pancreatic juice.
amylose
nounC1
/ˈæm.ɪ.ləʊz/A polysaccharide component of starch, consisting of long unbranched chains of glucose units linked by alpha-1,4 glycosidic bonds.
amylum
nounRare/Very Low Frequency
/ˈæm.ɪ.ləm/A substance (C₆H₁₀O₅)ₙ obtained chiefly from plants, consisting of polysaccharides and used in adhesives, sizing paper, and making fabrics stiff. It is a white, tasteless carbohydrate.
amyntor
nounExtremely rare
/əˈmɪntɔː/A protector or defender, especially one who wards off enemies or harm.

Showing 4321–4340 of 8734 words.