adjective/moɾˈtifeɾo/
deadly, lethal
Synonyms: letal
From Latin mortiferum, derived from mors (“death”) + -fer (“-bearing, -carrying”), originally a calque of Ancient Greek θᾰνᾰτηφόρος (thănătēphóros, “deadly, lethal”, literally “death-bearing”). By surface analysis, muerte + -ífero.