Orn

ORN is an acronym that can refer to several distinct concepts depending on the context.

In aviation, ORN is the IATA airport code for Oran Es Sénia International Airport, which serves Oran, Algeria. The airport handles international and domestic air traffic and functions as a regional gateway on the northwest coast of the country.

In medicine, ORN stands for osteoradionecrosis, a potential complication of radiation therapy in which irradiated bone becomes necrotic and has impaired healing. The condition most commonly affects the jaw but can involve other bones. Symptoms include pain, exposed bone, swelling, and infection. Management ranges from conservative wound care and antibiotics to surgical debridement and, in some cases, hyperbaric oxygen therapy.

In biochemistry, Orn (often abbreviated Orn) denotes ornithine, a non-proteinogenic amino acid involved in the urea cycle and polyamine biosynthesis. It plays a role in nitrogen metabolism and serves as a metabolic precursor to other compounds.

Additional meanings of ORN may exist in specialized fields, but the above represent the most common uses across aviation, medicine, and biochemistry.