Latin, meaning: protection, custody. 
(from the article `metalwork`) ...to the heavily ornamented style of the period, Plateresque. Using precious metal from the New World, goldsmiths such as Enrique and Juan de Arfe ...
A custodia is a shrine of precious metal in the shape of a cathedral, in which the host or the relics of a saint are carried in procession on certain solemn occasions.
protection, custody.