- airglow
- airhead
- airhose
- airily
- airiness
- airing
- airish
- airless
- airlift
- airlifter
- airlight
- airline
- airline chicken breast
- airliner
- airlock
- airmada
- airmail
- airman
- airmanship
- airmobile
- airpack
- airpark
- airpipe
- airplane
- airplane carrier
- airplane cloth
- airplane mode
- airplane spin
- airplane turn
- airplay
- airport
- airport code
- airproof
- airs
- airscrew
- airshed
- airship
- airshow
- airsick
- airsickness
- airside
- airspace
- airspeed
- airspeed indicator
- airstream
- airstrip
- airt
- airtight
- airtime
- airtsy-mairtsy
- airwash
- airwaves
- airway
- airwoman
- airworthy
- airy
- airy-fairy
- aisle
- ait
- aitch
- aitchbone
- ajar
- ajingle
- ajiva
- ajuga
- aka
- akala
- akaryote
- akasha
- akatea
- akathisia
- ake
- akeake
- akebi
- akela
- akene
- akhara
- akiapolaau
- akimbo
- akin
- akinesia
- akinete
- akinetic mutism
- akiraho
- akita
- akrasia
- akvavit
- al
- al Fayed
- al dente
- al desko
- al fine
- al-
- al-Aqsa
- al-Ashʿari
- al-Bukhari
- al-Farabi
- al-Fustat
- al-Lat
- al-Maliki
- al-Qaeda
- al-ʿUzza
- al.
- ala
- alabamine
- alabandite
- alabaster
- alabastos
- alabastron
- alabastrum
- alack
- alacrity
- alala
- alalia
- alameda
- alamo
- alamode
- alanine
- alannah
- alant starch
- alanyl
- alap
- alapa
- alar
- alarm
- alarm clock
- alarm reaction
- alarming
- alarmist
- alarum
- alarums and excursions
- alary
- alas
- alastor
- alate
- alb
- alb.
- alba
- albacore
- albarello
- albarium
- albata
- albatross
- albatross around one's neck
- albedo
- albedometer
- albeit
- albergo
- albert
- albertite
- albertype
- albescent
- albinism
- albino
- albinotic
- albite
- albizzia
- album
- album-oriented
- albumblatt
- albumen
- albumen paper
- albumen plate
- albumenize
- albumin
- albumin color
- albuminate
- albuminoid
- albuminous
- albuminuria
- albumose
- alburnum
- albuterol
- alc.
- alcahest
- alcaide
- alcalde
- alcaligenes
- alcayde
- alcazar
- alchem.
- alchemist
- alchemize
- alchemy
- alcheringa
- alcid
- alcidine
- alco-
- alcohol
- alcohol dehydrogenase
- alcohol dependence
- alcohol use disorder
- alcohol-free
- alcoholate
- alcoholic
- alcoholic psychosis
- alcoholicity
- alcoholism
- alcoholize
- alcoholometer
- alcoholysis
- alcool
- alcopop
- alcove
- alcyonarian
- aldehyde
- alder
- alder buckthorn
- alder fly
- alder flycatcher
- alderfly
- alderman
- aldermanry
- alderperson
- alderwoman
- aldicarb
- aldohexose
- aldol
- aldolase
- aldose
- aldosterone
- aldosteronism
- aldoxime
- aldrin
- ale
- ale conner
- aleatory
- alec
- alecithal
- aleck
- alecost
- alectryomancy
- alee
- alegar
- alehouse
- aleichem shalom
- alembic
- alembicated
- aleph
- aleph-bet
- aleph-null
- alerce
- alerion
- alert
- alethic
- alethiology
- alette
- aleuromancy
- aleurone
- aleurone layer
- alevin
- alewife
- alexander
- alexanders
- alexandrite
- alexia
- alexin
- alexipharmic
- alexithymia
- aleyard
- alf
- alfalfa
- alfalfa butterfly
- alfalfa weevil
- alfilaria
- alfisol
- alforja
- alfresco
- alg.
- alga
- algae
- algarroba
- algebra
- algebra of sets
- algebraic
- algebraic equation
- algebraic expression
- algebraic extension
- algebraic function
- algebraic geometry
- algebraic notation
- algebraic number
- algebraic operation
- algebraic topology
- algebraically closed field
- algebraist
- algerienne
- algerine
- algesia
- algesimeter
- algetic
- algicide
- algid
- algin
- algin fiber
- alginate
- alginic acid
- algo
- algo-
- algoid