MORBIFIC
infective, morbific, pathogenic
(adjective) able to cause disease; “infective agents”; “pathogenic bacteria”
Source: WordNet® 3.1
Etymology
Adjective
morbific (comparative more morbific, superlative most morbific)
That causes disease; sickening, pathogenic. [from 17th c.]
Pertaining to or caused by disease; diseased. [from 17th c.]
Source: Wiktionary
Mor*bif"ic, Mor*bif"ic*al, a. Etym: [L. morbus disease + -ficare (in
comp.) to make: cf. F. morbifique. See -fy.]
Definition: Causing disease; generating a sickly state; as, a morbific
matter.
Source: Webster’s Unabridged Dictionary 1913 Edition