Lewis & Short

mălagma, ătis, n. (malagma, ae, f., Veg. Vet. 2, 48, 9), = μάλαγμα, an emollient, poultice, cataplasm: malagmata contusa abunde mollescunt, Cels. 5, 17, 2; Col. 6, 17, 3; 5; Plin. 22, 24, 56, § 117; 25, 13, 95, § 153.
In dat. plur.: malagmatis, Plin. 31, 6, 33, § 63.