- acrostichum
- acrostichum aureum
- acrylamide
- acrylate
- acrylate resin
- acrylic
- acrylic acid
- acrylic fiber
- acrylic paint
- acrylic resin
- acrylonitrile
- acrylonitrile-butadiene-styrene
- act
- act as
- act involuntarily
- act of god
- act of terrorism
- act on
- act out
- act reflexively
- act superior
- act up
- act upon
- actable
- actaea
- actaea alba
- actaea rubra
- acth
- actias
- actias luna
- actifed
- actin
- actinal
- actinaria
- acting
- acting out
- actinia
- actinian
- actiniaria
- actiniarian
- actinic
- actinic dermatitis
- actinic keratosis
- actinic radiation
- actinic ray
- actinide
- actinide series
- actinidia
- actinidia arguta
- actinidia chinensis
- actinidia deliciosa
- actinidia polygama
- actinidiaceae
- actiniopteris
- actinism
- actinium
- actinoid
- actinolite
- actinomeris
- actinomeris alternifolia
- actinometer
- actinometric
- actinometrical
- actinometry
- actinomorphic
- actinomorphous
- actinomyces
- actinomycetaceae
- actinomycetal
- actinomycetales
- actinomycete
- actinomycetous
- actinomycin
- actinomycosis
- actinomycotic
- actinomyxidia
- actinomyxidian
- actinon
- actinopod
- actinopoda
- actinotherapy
- actinozoa
- actinozoan
- action
- action at law
- action mechanism
- action officer
- action painting
- action plant
- action potential
- action replay
- action spectrum
- actionable
- actitis
- actitis hypoleucos
- actitis macularia
- actium
- activase
- activate
- activated
- activated carbon
- activated charcoal
- activating
- activating agent
- activation
- activation energy
- activator
- active
- active agent
- active air defense
- active application
- active birth
- active citizen
- active immunity
- active matrix screen
- active placebo
- active site
- active transport
- active trust
- active voice
- actively
- activeness
- activewear
- activism
- activist
- activistic
- activity
- actomyosin
- actor
- actor's agent
- actor's assistant
- actor's line
- actress
- acts
- acts of the apostles
- actual
- actual damages
- actual eviction
- actual possession
- actual sin
- actualisation
- actualise
- actuality
- actualization
- actualize
- actually
- actuarial
- actuarial table
- actuary
- actuate
- actuated
- actuating
- actuation
- actuator
- actus reus
- acuate
- acuity
- acular
- aculea
- aculeate
- aculeated
- aculeus
- acumen
- acuminate
- acuminate leaf
- acupressure
- acupuncture
- acute
- acute accent
- acute angle
- acute anterior poliomyelitis
- acute brain disorder
- acute gastritis
- acute glaucoma
- acute glossitis
- acute hemorrhagic encephalitis
- acute inclusion body encephalitis
- acute kidney failure
- acute leukemia
- acute lymphoblastic leukemia
- acute lymphocytic leukemia
- acute myelocytic leukemia
- acute myeloid leukemia
- acute organic brain syndrome
- acute pyelonephritis
- acute renal failure
- acute schizophrenic episode
- acute triangle
- acute-angled triangle
- acutely
- acuteness
- acyclic
- acyclovir
- acyl
- acyl anhydrides
- acyl group
- acyl halide
- acylation
- acylglycerol
- ad