ˌmərsəˈda(a)rēən noun
( -s )
Usage: usually capitalized
Etymology: Medieval Latin merced-, merces mercy (in Ordo Beatae Mariae de Mercede Order of Our Lady of Mercy) + English -arian — more at mercy
: a member of the Order of Our Lady of Mercy founded at Barcelona about 1218 by St. Peter Nolasco