- achene
- Achernar
- Acheron
- Acheson
- Acheulean
- Acheulian
- à cheval
- achieve
- achieved status
- achievement
- achievement age
- achievement quotient
- achievement test
- achilary
- Achill
- achillea
- Achilles
- Achilles' heel
- Achilles heel
- Achilles jerk
- Achilles tendon
- Achill Island
- achimenes
- Achinese
- aching
- Achinsk
- achiote
- achiral
- Achish
- Achitophel
- achkan
- achlamydate
- achlamydeous
- ach-laut
- achlorhydria
- achlorophyllous
- acholia
- acholuria
- achondrite
- achondroplasia
- A Christmas Carol
- achroite
- achromat
- achromate
- achromatic
- achromatic colour
- achromaticity
- achromatic lens
- achromatic prism
- achromatin
- achromatism
- achromatize
- achromatophil
- achromatophilia
- achromatopsia
- achromatous
- achromic
- achromobacter
- A chromosome
- Achromycin
- Achsah
- Achtung
- achy
- ach-y-fi
- acicula
- acicular
- aciculate
- aciculum
- acid
- acid anhydride
- acidanthera
- acid-base equilibrium
- acid-base indicator
- acid cell
- acid deposition
- acid drop
- acid dust
- acid dye
- acid-fast
- acid-forming
- acid halide
- acidhead
- acid-head
- acid house
- Acid House
- acidic
- acidification
- acidify
- acidimeter
- acidimetry
- acidity
- acidize
- acid-loving
- acid metaprotein
- acid number
- acidogenic
- acidolysis
- acidometer
- acidophil
- acidophilic
- acidophilus milk
- acidosis
- acid precipitation
- acid radical
- acid rain
- acid reflux
- acid rock
- acid salt
- acid soil
- acid test
- acid test ratio
- acid-tongued
- acid trip
- acidulant
- acidulate
- acidulent
- acidulous
- aciduric
- acid value
- acid-washed
- acid washing
- acidy
- acierate
- aciform
- ACII
- acinaceous
- acinaciform
- acinarious
- acinetobacter
- aciniform
- acinous
- acinus
- Acis
- ack
- ack.
- ack-ack
- ackee
- ack-emma
- acker
- ackey
- acknowledge
- acknowledged
- acknowledgment
- ACL
- acle
- acleistocardia
- aclinic line
- ACLU
- ACM
- acme
- acmeism
- acme screw thread
- acmesthesia
- acmite
- acne
- acnegenic
- acnemia
- acnode
- acock
- acoelomate
- acoelous
- acoenaesthesia
- Acol
- acold
- acolyte
- Acoma
- Aconcagua
- aconite
- Açôres
- acorn
- acorn barnacle
- acorn chair
- acorn clock
- acorn spoon
- acorn squash
- acorn tube
- acorn valve
- acorn worm
- A Coruña
- acotyledon
- acouasm
- acouchi
- acousma
- acoustic
- acoustical cloud
- acoustically
- acoustical surveillance
- acoustical tile
- acoustic coupler
- acoustic feature
- acoustic feedback
- acoustic guitar
- acoustician
- acoustic impedance
- acoustic mine
- acoustic nerve
- acoustic neuroma
- acoustic ohm
- acoustic phonetics
- acoustic reactance
- acoustic resistance
- acoustics
- acoustic shock
- acoustic spectrography
- acoustic theodolite
- acoustic torpedo
- acoustimeter
- acoustoelectric
- acoustoelectronic
- acoustooptics
- acpt.
- acquaint
- acquaintance
- acquaintance rape
- acquaintance violence
- acquainted
- acquest
- acquiesce
- acquiesced
- acquiescence
- acquiescent
- acquire
- acquired behaviour
- acquired character
- acquired characteristic
- acquired drive
- acquired immune deficiency syndrome
- acquired immunity
- acquired taste
- acquiree
- acquirement
- acquis communautaire
- acquisition
- acquisition accounting
- acquisitive
- acquit
- acquittal
- acquittance
- acquitted
- acr-
- acraldehyde
- acrasin
- acre
- Acre
- acreage
- acred
- acre-foot
- acre-inch
- acre right
- acrid
- acridid
- acridine
- acriflavine
- acriflavine hydrochloride
- Acrilan
- acrimonious
- acrimony
- acritarch
- acritical
- acro-
- acroamatic
- acrobat
- acrobatic
- acrobatics
- acrocarpous
- acrocentric
- acrocephaly
- acrochordon
- Acrocorinth
- acrocyanosis
- acro dance
- acrodont
- acrodrome
- acrogen
- acrogynous
- acrolect
- acrolein
- acrolith
- acrology
- acromegaly
- acromicria
- acromion
- acron
- acronychal
- acronym
- acroparaesthesia
- acroparesthesia
- acropathy
- acropetal
- acrophobia
- acrophony
- acropolis
- Acropolis
- acrosome
- acrospire
- acrospore
- across
- across the board
- across-the-board
- acrostic
