Gallican a. : Of or pertaining to Gaul or France; Gallic; French; as, the Gallican church or clergy.

Gallican n. : An adherent to, and supporter of, Gallicanism.

Example:
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Taxonomy
Gallican, the Roman, prayers, Mozarabic, Mass, Gallican Rite, rite, Ambrosian, fragments, St. Germanus, Sanctus, Roman, Luxeuil, Bobbio, Pridie, theory, Stowe, Bidding Prayer.

Defination from the web:
Gallican Rite is a historical sub-grouping of the Roman Catholic liturgy in western Europe; it is not a single rite but actually a family of ... Ireland too is known to have had a form of this Gallican Liturgy mixed with Celtic customs. ...