Meaning

noun the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited

noun a prayer said 3 times a day by Roman Catholics in memory of the Annunciation

origin* (given name): From Latin Angelus and its etymon Ancient Greek ἄγγελος (ángelos, “angel”). * (common noun): From the first word (angelus) of its Latin incipit, "Angelus Domini nuntiavit Mariæ": "the Angel of the Lord declared unto Mary". Doublet of angel.

Etymology from Wiktionary, CC BY-SA 3.0