- AAT... to Ablepsy...
- Ablutomania... to Abruption...
- Abscess... to Acanthrocytosis...
- Acapnia... to Accreta...
- Accretio... to Acheiria...
- Achillobursitis... to Acidocytosis...
- Acidopenia... to Acragnosis...
- Acrania... to Acropachy...
- Acropachyderma... to Actinoneuritis...
- Action... to Additional...
- Adduction... to Adenopharyngitis...
- Adenophlegmon... to Adrenal...
- Adrenalism... to Affection...
- Afibrinogenemia... to Agranulocytopenia...
- Agranulocytosis... to Akiyami...
- Akureyri... to Alder...
- Aldosteronism... to Allocheiria...
- Almeida... to Amaurosis...
- Amaurotic... to Amnionitis...
- Amoral... to Analphalipoproteinemia...
- Anaphylactic... to Anencephalus...
- Anergasia... to Angiokeratosis...
- Angioleiomyoma... to Anhedonia...
- Anhidrosis... to Anomaly...
- Anomia... to Anthracosilicosis...
- Anthracosis... to Anxiety...
- Aorta... to Apneumatosis...
- Apodia... to Arachnoiditis...
- Araneism... to Ariboflavinosis...
- Arizona... to Arteriosclerosis...
- Arteriospasm... to Arthroscopic...
- Arthrosis... to Asherman...
- Asialia... to Asthenospermia...
- Asthma... to Atheroembolism...
- Atheroma... to Attention...
- Attrition... to Autophony...
- Autophony... to Azygos...