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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)

antiarrhythmic
adjectivenounlow
/ˌæntiəˈrɪðmɪk/A substance or treatment that prevents or corrects an irregular heartbeat.
antiart
nounC1
/ˌæntiˈɑːt/Works or activities deliberately opposing traditional concepts of art, often intended to shock, question, or reject established aesthetic values.
antiarthritic
adjectivenounC2
/ˌæn.ti.ɑːˈθrɪt.ɪk/Used to treat arthritis or its symptoms.
antiatom
nounVery low
/ˌæntiˈætəm/An atom consisting of antiparticles (such as antiprotons, antineutrons, and positrons).
antiauxin
nounC2 (Very Low Frequency, Technical)
/ˌæntiˈɔːksɪn/A chemical substance that inhibits the growth-regulating effects of auxins (plant hormones).
antibacchius
nounVery Low (Specialist Term)
/ˌantɪbəˈkʌɪəs/A metrical foot in poetry consisting of two stressed syllables followed by one unstressed syllable (e.g., "DÚM-DÚM-də").
antibacterial
adjectivenounB2
/ˌæn.ti.bækˈtɪə.ri.əl/A substance or agent that kills or inhibits the growth of bacteria.
antiballistic missile
nounLow (specialized technical/military/political contexts)
/ˌæn.ti.bəˈlɪs.tɪk ˈmɪ.saɪl/A defensive missile system designed to intercept and destroy ballistic missiles in flight before they reach their targets.
antiballistic missile treaty
nounlow
/ˌæn.ti.bəˌlɪs.tɪk ˈmɪ.saɪl ˌtriː.ti/An international agreement that restricts the development, deployment, or use of antiballistic missile (ABM) defence systems.
antibaryon
nounC2 - Extremely low frequency
/ˌæn.tiˈbær.i.ɒn/The antiparticle of a baryon, having opposite quantum numbers and, in many cases, opposite electric charge.
antibes
nounLow
/ɒ̃ˈtiːb/A coastal city and resort in southeastern France, on the French Riviera between Cannes and Nice.
antibiosis
nounC2 (Highly specialized/technical)
/ˌantɪbʌɪˈəʊsɪs/An antagonistic association between two or more organisms, especially microorganisms, that is detrimental to at least one of them; a biological interaction where one organism harms another.
antibiotic
adjectivenounB2
/ˌæntibaɪˈɒtɪk/A substance, such as penicillin, that destroys or inhibits the growth of bacteria and is used to treat infections.
antibody
nounC1
/ˈæntɪˌbɒdi/A protein produced by the body's immune system that recognizes and binds to specific foreign substances (antigens), such as bacteria or viruses, to help destroy them.
antibody-mediated immunity
nounC2
/ˈæntiˌbɒdi ˈmiːdieɪtɪd ɪˈmjuːnəti/The form of acquired immunity where B cells produce antibodies that neutralize pathogens or mark them for destruction.
antibuser
nounExtremely Low (Obsolete/Historical/Niche)
/ˈæn.tiˌbʌs.ə/A person who is strongly opposed to or works against a bus service or transportation system.
antic
adjectivenounverb-intransitiveLow
/ˈæn.tɪk/A playful, silly, or absurd act or gesture; a grotesque or bizarre performance.
anticapitalist
adjectivenounLow
/ˌæntiˈkæpɪtəlɪst/Opposed to capitalism or its principles.
anticatalase
nounExtremely Rare / Technical
/ˌantɪˈkætəleɪz/A substance that inhibits or counteracts the enzyme catalase.
anticatalyst
nounC2
/ˌæntiˈkætəlɪst/A substance that inhibits or slows down a chemical reaction.

Showing 5401–5420 of 8734 words.