noun

• The capital city of Bulgaria.
• A female given name from Ancient Greek
• A river, and surrounding region of Madagascar
• (space science, telescope, NASA) Acronym of Stratospheric Observatory for Infrared Astronomy. (a telescope atop a Boeing 747SP aircraft with an effective diameter of 2.5 meters at altitudes up to 13.7 kilometers)
• (medicine) Acronym of Surround Optical Fiber Immunoassay.