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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)

amp
abbreviationnounC1
/æmp/The basic unit of electric current.
amp up
verbC1
/ˌæmp ˈʌp/To increase the intensity, volume, or level of something.
ampelopsis
nounVery Low
/ˌampɪˈlɒpsɪs/A woody vine of the genus Ampelopsis, commonly known as porcelain berry.
ampelos
nounVery Low (C2+)
/ˈæm.pɪ.lɒs/A Greek word meaning 'vine', specifically the grapevine (Vitis vinifera).
amperage
nounC2
/ˈæmpərɪdʒ/The strength of an electric current measured in amperes.
ampere
nounC1
/ˈæmpɛː/A unit of electric current, equal to the flow of one coulomb of charge per second.
ampere's law
nounVery Low
/ˈæmpeəz lɔː/A fundamental law of electromagnetism that quantitatively relates the magnetic field around a closed loop to the electric current passing through that loop.
ampere-hour
nounLow
/ˌæmpeər ˈaʊə/A unit of electric charge equal to the charge transferred by a steady current of one ampere flowing for one hour.
ampere-turn
nounC2
/ˈæmpɛː tɜːn/A unit of magnetomotive force in the International System of Units, defined as the force produced by one ampere of current flowing through one turn of a coil in a vacuum.
amperometric titration
nounC2
/ˌæmpərəʊˈmetrɪk taɪˈtreɪʃən/A quantitative chemical analysis technique where the endpoint of a titration is determined by measuring the electric current produced by the reaction.
ampersand
nounC1
/ˌæm.pəˈsænd/A typographical symbol (&) representing the conjunction 'and'.
amphetamine
nounC2
/amˈfɛtəmiːn/A strong synthetic stimulant drug that increases alertness and concentration.
amphiaraus
nounVery Low / Obscure
/ˌæmfɪəˈreɪəs/A proper noun referring to a legendary Greek hero and seer from the myth of the Seven Against Thebes.
amphiarthrosis
nounVery Low (Specialist Term)
/ˌæmfiɑːˈθrəʊsɪs/A type of joint that permits only slight movement, where the bones are connected by fibrocartilage or hyaline cartilage.
amphiaster
nounC2
/ˈæmfiˌæstə(r)/A biological structure formed in a cell during mitosis, consisting of two asters (clusters of microtubules) at opposite poles, connected by spindle fibres.
amphibia
nounC1
/æmˈfɪb.i.ə/The taxonomic class of vertebrates that includes frogs, toads, salamanders, and caecilians, characterized by a life cycle typically involving an aquatic larval stage and a terrestrial adult stage, permeable skin, and being ectothermic.
amphibian
adjectivenounB2
/æmˈfɪb.i.ən/A cold-blooded vertebrate animal that lives in water when young (breathing through gills) and typically lives on land as an adult (breathing through lungs). Examples include frogs, toads, salamanders, and newts.
amphiblastula
nounVery Low (C2/Technical)
/ˌæmfɪˈblæstjʊlə/A specific larval stage in the development of certain sponges, characterized by a hollow ball of cells with two distinct types of cells.
amphibole
nounVery low
/ˈæmfɪbəʊl/A group of dark, rock-forming silicate minerals with a double-chain crystalline structure.
amphibolite
nounVery Low
/amˈfɪbəlaɪt/A type of metamorphic rock composed mainly of amphibole minerals.

Showing 4201–4220 of 8734 words.