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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)

alluvium
nounC2
/əˈluːviəm/A deposit of sand, mud, silt, or clay left by flowing water, especially in a river valley or delta.
ally
nounverbverb-intransitive+1B2
/ˈæl.aɪ/ (noun), /əˈlaɪ/ (verb)A person, group, or country that is united with another for a common purpose; to combine or unite for mutual benefit.
allyl
adjectivenounVery Low
/ˈalɪl/A univalent unsaturated hydrocarbon radical (CH₂=CH-CH₂-) derived from propylene, containing a double bond.
allyl alcohol
nounC2
/ˈalʌɪl ˈalkəhɒl/A colorless liquid organic compound with a pungent mustard-like odor, having the chemical formula C₃H₅OH.
allyl caproate
nounVery Low (Technical)
/ˌælɪl ˈkæprəʊˌeɪt/A chemical compound, specifically an ester, used as a synthetic flavouring agent to impart a fruity, pineapple-like aroma.
allyl chloride
nounVery Rare (C2+)
/ˌælɪl ˈklɔːraɪd/A volatile, flammable, and toxic organic compound with the chemical formula C3H5Cl, used as an intermediate in the production of other chemicals.
allyl group
nounVery Low
/ˈalɪl ɡruːp/A specific organic chemical functional group with the formula –CH₂–CH=CH₂.
allyl mercaptan
nounC2
/ˈalʌɪl məːˈkaptan/A volatile organosulfur compound with the chemical formula C₃H₆S, characterized by its strong garlic-like odour.
allyl resin
nounRare/Very Low Frequency
/ˈælɪl ˈrɛzɪn/A synthetic thermosetting polymer made from esters of allyl alcohol, used in coatings, adhesives, and molding compounds.
allyl sulfide
nounC2
/ˈalʌɪl ˈsʌlfaɪd/A colorless, volatile, organic chemical compound with a strong garlic-like odor, commonly found in garlic, onions, and other Allium plants.
allyl sulphide
nounVery Low (Specialized Technical Vocabulary)
/ˌalʌɪl ˈsʌlfʌɪd/An organosulfur compound characterized by the allyl group (–CH2–CH=CH2) bonded to a sulfur atom.
allylthiourea
nounVery Low / Technical
/ˌælɪlˌθaɪəʊˈjʊərɪə/A specific organosulfur compound with the chemical formula C4H8N2S, used as a corrosion inhibitor and in biochemical research.
allyship
nounRising rapidly
/ˈæ.lɪ.ʃɪp/The practice or state of being an ally; the supportive, active, and consistent practice of advocating for and with marginalized groups by someone outside those groups.
alma
nounRare
/ˈælmə/An apple. A cultivated variety of apple, often specifically the Alma apple.
alma mater
nounC2
/ˌælmə ˈmɑːtə/The school, college, or university that a person has graduated from and/or feels a strong, often nostalgic, connection to.
alma-ata
nounLow
/ˌalmə ˈɑːtə/The former name (1921–1997) of Almaty, the largest city in Kazakhstan.
alma-tadema
nounVery Low
/ˌælmə ˈtædɪmə/A surname of Dutch-Frisian origin, most famously associated with the Victorian painter Sir Lawrence Alma-Tadema.
almada
nounVery Low
/ælˈmɑːdə/A Portuguese municipality on the south bank of the Tagus River, opposite Lisbon.
almaden
nounVery Low
/ˌalməˈdeɪn/A specific place name, most notably a historical mercury-mining region in Spain.
almagest
nounC2
/ˈalmədʒɛst/A comprehensive treatise on astronomy, most famously the 2nd-century work by Ptolemy which served as the authoritative text for over a thousand years.

Showing 3401–3420 of 8734 words.