Am·bro·sian, a. Of or pertaining to St. Ambrose; as, the Ambrosian office, or ritual, a formula of worship in the church of Milan, instituted by St. Ambrose.
 Ambrosian chant, the mode of signing or chanting introduced by St. Ambrose in the 4th century.

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 Chant, n.
 1. Song; melody.
 2. Mus. A short and simple melody, divided into two parts by double bars, to which unmetrical psalms, etc., are sung or recited. It is the most ancient form of choral music.
 3. A psalm, etc., arranged for chanting.
 4. Twang; manner of speaking; a canting tone. [R.]
    His strange face, his strange chant.   --Macaulay.
 Ambrosian chant, See under Ambrosian. Chant royal [F.], in old French poetry, a poem containing five strophes of eleven lines each, and a concluding stanza. -- each of these six parts ending with a common refrain.
 Gregorian chant. See under Gregorian.

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