A square of white linen worn at first on the head, but now about the neck and shoulders, by priests of the Roman Catholic Church while saying Mass.
A hood, or cape with a hood, made of lined with gray fur, formerly worn by the clergy; -- written also amess, amyss, and almuce.
A square of white linen, folded diagonally, worn by the celebrant priest, on the head or about the neck and shoulders. (Davis, H.W. C. (ed.) Medieval England, 615)