- amaurosis
- amaxophobia
- amazon
- ambergris
- ambidexterity
- ambidextrous
- ambiguos nucleus
- ambiguous layer
- ambilevosity
- amblyaphia
- amblychromatic
- amblyopia
- amboceptoid
- amboceptor
- ambulance
- ambulance convoy
- ambulance man
- ambulance plane
- ambulance station
- ambulance train
- ambulant
- ambulatory
- ambustion
- ameba
- amebadiastase
- amebaism
- amebicide
- amebiosis
- amebism
- amebocytogenous
- ameboid movement
- amenorrhea
- amenorrhoea
- ametropia
- ametropy
- aminiotic villus
- aminocyclase
- aminolysis
- amitosis
- ammonemia
- amnemonic
- amnesia
- amnia
- amnion
- amniotic cavity
- amniotomy
- amobiasis
- amoeboma
- amok
- amoralia
- amorphic gene
- amorphinism
- amphiarthrosis
- amphiastral mitosis
- amphibious
- amphicyte
- amphikaryon
- amphinucleus
- amphistomiasis
- amphitrichous
- amphitypy
- amphocyte
- amphophilic basophil
- amphophilic oxyphil
- amphoric
- amphoricity
- ampicllin
- amplifler
- ampulla
- ampullitis
- amputating saw
- amputation
- amputee
- amychophobia
- amyelencephalus
- amyelic
- amyelotrophy
- amygdala
- amygdalitis
- amygdalolith
- amyloid
- amyloidosis
- amylolysis
- amyoplasia
- amyosthenia
- anabasis
- anabolic
- anabrosis
- anachoresis
- anacrotism
- anadenia
- anaemia
- anaerobiosis
- anaesthesia
- anaesthetic
- anaesthetise
- anaesthetize
- anakatadidymus
- anal canal
- anal fissure