Crossword clue: the song of the virgin mary, luke i. 46; -- so called because it commences with this word in the vulgate.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
(Luke) the canticle of the Virgin Mary (from Luke 1:46 beginning `Magnificat anima mea Dominum')