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Definition of Mortiferous
1. a. Bringing or producing death; deadly; destructive; as, a mortiferous herb.
Definition of Mortiferous
1. Adjective. (rare) Causing spiritual death. (defdate from 16th c.) ¹
2. Adjective. Causing physical death; deadly, fatal, lethal. (defdate from 16th c.) ¹
¹ Source: wiktionary.com