Term: edema (Americak English) or oedema (British English)
Origin: Anc Greek οίδημα/edema(swelling)
>οίδα/eda(=see as edema is seen due to its size)
The same root has the name of the mythical Greek king in word Oedipus (Οἰδίπους Oidípous) meaning "swollen-footed")
Edema is an abnormal accumulation of fluid beneath the skin in the small cavities that surround the body tissues and organs.