[syn: infectious, infective]
The Collaborative International Dictionary of English v.0.48:
Infective \In*fect"ive\, a. [L. infectivus pertaining to
   dyeing.]
   Infectious. --Beau. & Fl.
   [1913 Webster]
         True love . . . hath an infective power. --Sir P.
                                                  Sidney.
   [1913 Webster]
WordNet (r) 3.0 (2006):
infective
    adj 1: able to cause disease; "infective agents"; "pathogenic
           bacteria" [syn: infective, morbific, pathogenic]
    2: caused by infection or capable of causing infection; "viruses
       and other infective agents"; "a carrier remains infective
       without himself showing signs of the disease" [syn:
       infectious, infective]