KidneyNotes Just overheard someone use the word "oedema" -- and they pronounced the "o." Oawesome.
Edema (American English) or Oedema (British English), formerly known as "dropsy" or "hydropsy," is an abnormal accumulation of fluid beneath the skin, or in one or more cavities of the body. Source: Wikipedia.
Technically, the Greek origin of the word requires "oe-" for correct spelling. There are many medical terms that differ between American and British English, for example: anaemia, oesophagus, haemorrhage, haemophilia, etc.