WordWeb Online

1. (of disease) capable of being transmitted by infection
   - catching, communicable, contagious, contractable, transmittable
    
2. Occurring among members of a family usually by heredity
   - familial, genetic, hereditary, inherited, transmitted
    
3. Inherited or inheritable by established rules (usually legal rules) of descent
   "transmissible tradition"
   - ancestral, hereditary, patrimonial

See also: heritable, infectious, inheritable, transmit