Umbriel is a moon orbiting Uranus that was discovered in 1851 by William Lassell. It is named after a character in Alexander Pope's poem "The Rape of the Lock." Some synonyms for the word Umbriel include satellite, celestial body, natural satellite, moon, and heavenly body. These all describe the same type of astronomical object but are interchangeable in their use. In scientific circles, the word Umbriel would be most commonly used, but in general conversation, someone might refer to it simply as a moon or satellite. Nonetheless, all synonyms for Umbriel emphasize its unique, awe-inspiring nature as one of the many mysteries of our solar system.