Collins American English Dictionary: American Words Starting With “A”
- a ... a pretty penny
- a priori ... Ab
- ab initio ... abecedarian
- abed ... ably
- ABM ... abranchiate
- abrasion ... absolutive
- absolutize ... abysmal
- abyss ... accelerate
- acceleration ... accompany
- accomplice ... accusal
- accusation ... acetum
- acetyl ... acidanthera
- acidhead ... acquire
- acquired character ... ACSW
- act ... activize
- actomyosin ... ad rem
- ad valorem ... additional
- additive ... adhesive
- adhesive tape ... administrative
- administrator ... adrenocortical
- adrenocorticosteroid ... Adventist
- adventitia ... aëdes
- aedile ... aeroelastic
- aeroembolism ... aesthetics
- aestival ... affixation
- affixture ... Africanism
- Africanist ... afterword
- afterworld ... Agent Orange
- agent provocateur ... aglow
- agnail ... agrobiology
- agrochemical ... ail
- ailanthus ... Air Medal
- air mile ... airglow
- airhead ... aka
- Akan ... Alaric
- alarm ... Ålborg
- Albucasis ... alder
- alderfly ... alexipharmac
- Alexis ... Alhambresque
- Ali ... alkali
- alkali flat ... all thumbs
- all told ... Allen wrench
- Allenby ... allophone
- alloplasm ... almond
- almoner ... alpha particle
- Alpha Piscis Austrini ... altercation
- alterity ... alumroot
- Alundum ... amatol
- amatory ... ambulance
- ambulance-chaser ... American kestrel
- American Legion ... amino
- amino acid ... amoebocyte
- amok ... amphimacer
- amphimixis ... amusement
- amusement park ... anabolism
- anabranch ... analytical
- analytical chemistry ... ancestress
- ancestry ... Andersonville
- Andes (Mountains) ... anemosis
- anencephaly ... angiology
- angioma ... angst
- angstrom ... anion
- anis ... Annette
- annex ... anopheles
- anorak ... ante
- ante meridiem ... anthracene
- anthracite ... antibiotic
- antibody ... antihypertensive
- antiknock ... antiphonary
- antiphony ... antivivisection
- antiwar ... ao dai
- Aomori ... apheresis
- aphesis ... apocope
- apocrine ... apostolic
- apostolic delegate ... appendectomy
- appendicitis ... apportion
- apportionment ... apsidal
- apsis ... ar-
- Ara ... Araxes
- arb ... archaeopteryx
- archaeornis ... architrave
- archival ... Areopagite
- Areopagus ... argyle
- Argyll ... ark
- ark of the covenant ... armorbearer
- armored ... arrange
- arrangement ... arsis
- arson ... articulation
- articulator ... as good as
- as hell ... ascensive
- ascent ... Ashkenazi
- Ashkhabad ... aspartic acid
- Aspasia ... assault
- assault and battery ... assn
- assoc ... asthenopia
- asthenosphere ... Asturias
- astute ... at grade
- at hand ... at the point of
- at the ready ... atheling
- Athelstan ... atom
- atom bomb ... attaché
- attaché case ... attrited
- attrition ... audiology
- audiometer ... Aurelia
- Aurelian ... Australoid
- australopithecine ... autodyne
- autoecious ... autostrada
- autosuggestion ... aver
- average ... aw
- aw-shucks ... axion
- axis ... Azores
- azote ... azygous
