Oedema n. : A swelling from effusion of watery fluid in the cellular tissue beneath the skin or mucous membrance; dropsy of the subcutaneous cellular tissue.

Example:
What's the difference in etiology of pulmonary Oedema and pleural effusion?

Taxonomy
edema, tissue, fluid, blood vessels, protein, permeability, hydrostatic pressure, oncotic pressure, organs, vessels, heart failure, periorbital edema, vessel wall, Pulmonary edema, connective tissue, lymphatics, failure, free encyclopedia.

Defination from the web:
Oedema (British English; both words from the Greek οίδημα), formerly known as dropsy or hydropsy, is an abnormal ... Peripheral oedema". Am J Med 113 (7): 580–6. doi:10.1016/S0002-9343(02)01322-0. PMID 12459405. ...