The Collaborative International Dictionary
contractable
contractable \con*tract"a*ble\ (k[o^]n*tr[a^]kt"[.a]*b'l), adj. capable of being transmitted by infection; same as communicable, 1; -- of disease.
Syn: catching, communicable, contagious, transmissible, transmittable.
Wiktionary
contractable
a. Capable of being contracted (in various senses).
WordNet
contractable
adj. (of disease) capable of being transmitted by infection [syn: catching, communicable, contagious, transmissible, transmittable]