Bringing or producing death; deadly; fatal; destructive.
In very short time after, those two infected parts were growne mortiferous, and would disperse abroad indifferently, to all parts of the body; whereupon, such was the quality of the disease, to shew it selfe by blacke or blew spottes, which would appeare on the armes of many, others on their thighes, and every part else of the body: in some great and few, in others small and thicke.
They have many sacred implements or relics, which are for the most part carefully kept concealed from the eyes of all, but especially from the women, such as, pieces of rock crystal, said to have been extracted by them from individuals who were suffering under the withering influence of some hostile sorcerers; the pringurru, a sacred piece of bone (used sometimes for bleeding), etc. The latter, if burned to ashes in the fire, possesses mortiferous influence over enemies.
An account of the manners and customs of the Aborigines and the state of their relations with Europeans, by Edward John Eyre
Latin mortifer, mortiferus, from morti- (from mort-, mors death) + -fer, -ferus -fer, -ferous