Sylvatic is a scientific term referring to diseases or pathogens affecting only wild (sylvan means forest-dwelling) animals. In the context of animal research, its opposite is domestic, which refers to pets, farm animals or other animals which do not dwell in the wild. The word `sylvatic` is also simply a synonym for `sylvan` (or `silvan`) =...
belonging to or found in woods
• (a.) Sylvan.
Occurring in or affecting wild animals. ... Origin: L. Silva, woods ... (05 Mar 2000) ... 
Existing normally in the wild, not in the human environment.
Syl·vat'ic adjective [ Latin sylvaticus , better silvaticus . See Silvan , adjective ] Sylvan. [ R.] 
Type: Term Pronunciation: sil-vat′ik Definitions: 1. Occurring in or affecting wild animals.