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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)

aminocarb
nounExtremely Rare
/ˌamɪnəʊˈkɑːb/A specific synthetic carbamate pesticide used to control insect pests.
aminocitric acid
nounC2+
/əˌmiːnəʊˈsɪtrɪk ˈæsɪd/A type of organic acid containing both amino and carboxylic acid groups, derived from citric acid.
aminocyclohexane
nounLow (Specialist)
/ˌæmɪnəʊˌsaɪkləʊˈhekseɪn/A cyclohexane ring in which one or more hydrogen atoms are replaced by an amino group (-NH₂).
aminoglutethimide
nounExtremely Rare (Specialist/Technical)
/əˌmiːnəʊɡluːˈtɛθɪmaɪd/A synthetic chemical compound, specifically a non-steroidal aromatase inhibitor formerly used as an antiepileptic and now primarily used to treat Cushing's syndrome and certain hormone-dependent cancers like breast cancer.
aminoglycoside
adjectivenounC2
/əˌmiːnəʊˈɡlaɪkəʊsaɪd/A type of antibiotic that works by binding to bacterial ribosomes.
aminopeptidase
nounVery Low / Specialist
/ˌæmɪnəʊˈpɛptɪdeɪz/An enzyme that catalyzes the removal of the amino-terminal amino acid from a protein or peptide.
aminophenazone
nounC1/C2
/əˌmiːnəʊˈfɛnəzəʊn/A synthetic drug, derived from pyrazolone, used as an analgesic (pain reliever) and antipyretic (fever reducer).
aminophenol
nounC2
/əˌmiːnəʊˈfiːnɒl/Any of several isomeric organic compounds consisting of a phenol group with an amino group attached to the benzene ring.
aminophylline
nounVery Low
/ˌæmɪnə(ʊ)ˈfɪliːn/A medication combining theophylline and ethylenediamine, used to treat asthma, bronchitis, and other respiratory conditions by relaxing and opening lung airways.
aminoplast
nounC2 (Very low frequency; highly specialized technical term)
/əˈmiːnəʊplæst/A synthetic resin made by the polycondensation of amines or amides with aldehydes, used especially in moulding powders and adhesives.
aminopyrine
nounVery Low
/əˌmiːnəʊˈpaɪəriːn/A synthetic, white crystalline powder historically used as an analgesic (pain reliever) and antipyretic (fever reducer).
aminosuccinic acid
nounC2
An amino acid that occurs as a byproduct in the metabolism of aspartic acid; more commonly known as aspartic acid.
aminosugar
nounC2
/ˌæmɪnəʊˈʃʊɡə/A sugar molecule in which one or more hydroxyl groups are replaced by an amino group.
aminotransferase
nounC2 (Very rare outside biochemistry/medical contexts)
/əˌmiː.nəʊˈtræns.fər.eɪz/An enzyme that catalyzes the transfer of an amino group from a donor molecule (typically an amino acid) to an acceptor molecule (typically an alpha-keto acid).
amiodarone
nounLow
/ˌæmiˈəʊdərəʊn/A potent antiarrhythmic medication used to treat and prevent serious, life-threatening ventricular arrhythmias.
amir
nounC2
/əˈmɪə/A Muslim leader, commander, or ruler, especially in the Middle East and parts of South Asia.
amis
nounC1
/ˈæmiː/A plural noun (rare) meaning friends, companions, or associates; a term of French origin used historically or archaically in English.
amish
adjectivenounC1
/ˈɑːmɪʃ/A conservative Anabaptist Christian group, originating in Switzerland and Alsace in the late 17th century, known for simple living, plain dress, and reluctance to adopt modern technology.
amitabha
nounRare
/ˌʌmɪˈtɑːbə/A Sanskrit word meaning 'Immeasurable Light' or 'Infinite Light,' referring primarily to the principal Buddha in Pure Land Buddhism.
amitate
nounExtremely Low (Academic/Technical)
/ˈæm.ɪ.teɪt/The anthropological term for a specific social relationship between a child and their maternal uncle, characterized by distinctive rights, privileges, and responsibilities within certain kinship systems.

Showing 4081–4100 of 8734 words.