Browse by letter

English Words Starting With A

8,734 entries — pick a word to see its definition, pronunciation, and usage.

Filter

Parts of speech

Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

amphora
nounC2
/ˈæmfərə/A tall ancient Greek or Roman jar with two handles and a narrow neck, used for storing oil, wine, or other liquids.
amphoriskos
nounVery Low
/ˌæmfəˈrɪskɒs/A small ancient Greek or Roman amphora, typically used for storing perfumes, oils, or cosmetics.
amphotericin
nounVery low
/ˌæmfəˈtɛrɪsɪn/An antifungal antibiotic produced by Streptomyces nodosus, used to treat serious fungal infections.
ampicillin
nounC2
/ˌæmpɪˈsɪlɪn/A semi-synthetic penicillin antibiotic used to treat various bacterial infections.
amplexus
nounVery low (C2+)
/æmˈplɛksəs/The mating embrace in amphibians (especially frogs and toads), where the male clasps the female from behind to fertilize eggs as she releases them.
ampliation
nounC1/C2
/ˌamplɪˈeɪʃən/The act of extending or expanding something, particularly the scope of a document, a discussion, or a time period.
amplidyne
nounExtremely Rare/Obsolete
/ˈæmplɪdaɪn/A specific type of rotating magnetic amplifier; an electromechanical device that uses a small input signal to precisely control a large amount of electrical power.
amplification
nounC1
/ˌæmplɪfɪˈkeɪʃən/The action of making something larger, louder, or more significant, either literally (e.g., sound) or figuratively (e.g., an idea).
amplifier
nounB2
/ˈæm.plɪ.faɪ.ər/An electronic device that increases the power, voltage, or amplitude of a signal, most commonly an audio signal.
amplify
verbverb-intransitiveverb-transitiveC1
/ˈæm.plɪ.faɪ/To make something larger, stronger, more significant, or louder, especially sound, a signal, an emotion, or an idea.
amplitude
nounLow (C1/C2)
/ˈamplɪtjuːd/The maximum extent of a vibration or oscillation, measured from the position of equilibrium; the greatest distance that a wave, especially a sound or radio wave, moves up and down.
amplitude modulation
nounC1-C2
/ˈæmplɪtjuːd ˌmɒdjʊˈleɪʃ(ə)n/A method of encoding information onto a radio wave by varying its strength (amplitude) while keeping its frequency constant.
ampoule
nounC2
/ˈæmpuːl/A small sealed glass capsule containing a sterile liquid for injection, designed to be broken open.
ampule
nounC1
/ˈæmpuːl/A small, sealed glass container for holding a single dose of a liquid, especially medicine for injection.
ampulla
nounC1/C2
/æmˈpʊlə/A small rounded or flask-shaped container, typically one for holding liquids such as oil or perfume.
ampulla of lorenzini
nounVery low (C2+)
/ˌæmˈpʊlə əv ləˈrɛnziːni/A specialized sensory organ found in cartilaginous fish like sharks and rays, capable of detecting weak electric fields in water.
ampullula
nounVery Rare
/æmˈpʌljʊlə/A small ampulla or flask-shaped vessel.
amputate
verbverb-transitiveC1
/ˈæmpjuteɪt/To cut off a limb, digit, or other projecting part of the body surgically.
amputee
nounC1
/ˌæmpjʊˈtiː/A person who has had a limb or limbs surgically removed.
ampycus
nounExtremely Rare / Obscure
/ˈæmpɪkəs/A mythological Greek figure, son of King Oeagrus and the nymph Methone, and a close companion or attendant to the god Dionysus. He is often associated with music and revelry.

Showing 4261–4280 of 8734 words.