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The word mortifero could not be parsed. Trying a normal dictionary lookup:
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mortĭfer or (rarely) mortĭfĕrus, ĕra, ĕrum, adj. [mors-fero], death-bringing, death-dealing, deadly, fatal (class.; syn.: lethalis, funestus): poculum, Cic. Tusc. 1, 29, 71: morbus, id. Div. 1, 30, 63: vulnus, id. Leg. 2, 5, 13: bellum, Verg. A. 6, 279: gravior dolor nec tamen mortiferus, Cels. 4, 2 init.; 5, 26, 22; Aug. de Util. Cred. § 36: res mortifera est inimicus pumice levis, Juv. 9, 95; 10, 10.
Neutr. plur. as subst.: mortĭfĕra, um, deadly things: cur tam multa mortifera terra mortique (deus) disperserit, Cic. Ac. 2, 38, 120 (B. and K. pestifera).
Hence, adv.: mortĭfĕrē, mortally, fatally (post-Aug.): mortifere aegrotare, Plin. Ep. 3, 16, 3: vulnerare, Dig. 9, 2, 36, § 1.