Learn how to say Rosary correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word rosary:
noun (plural rosaries)
(in the Roman Catholic Church) a form of devotion in which five (or fifteen) decades of Hail Marys are repeated, each decade preceded by an Our Father and followed by a Glory Be.
a string of beads for keeping count in a rosary or in the devotions of some other religions, in Roman Catholic use 55 or 165 in number:
she is telling her rosary
a book containing a rosary.
late Middle English (in the sense ‘rose garden’): from Latin rosarium ‘rose garden’, based on rosa ‘rose’