Pronunciation: (ûr'sidz), [key]
—n. (used with a pl. v.) Astron.
a collection of meteors comprising a meteor shower (Ur'sid me'teor show"er) visible around December 22 and having its apparent origin in the constellation Ursa Major.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.