Definition of Umbriel in English:

Umbriel

Syllabification: Um·bri·el
Pronunciation: /ˈəmbrēəl
 
/
Astronomy
A satellite of Uranus, the thirteenth closest to the planet, discovered in 1851, having a diameter of 739 miles (1,190 km).

Origin

named after a sprite in The Rape of the Lock by Alexander Pope.

Definition of Umbriel in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up