Mercedarian
noun
Mer·ce·dar·i·an
ˌmərsəˈda(a)rēən
plural -s
: a member of the Order of Our Lady of Mercy founded at Barcelona about 1218 by St. Peter Nolasco
Word History
Etymology
Medieval Latin merced-, merces mercy (in Ordo Beatae Mariae de Mercede Order of Our Lady of Mercy) + English -arian