Emily Dickinson Lexicon

CAT'A-PLASM, n. [Gr. καταπλασμα, from καταπλασσω, to anoint, or to spread as a plaster.]

A poultice; a soft and moist substance to be applied to some part of the body, to excite or repel heat, or to relax the skin, &c. When mustard is an ingredient, it is called a sinapism. – Encyc.