"Herptile" (sometimes abbreviated as "herp") is a term that refers to either a reptile or amphibian. It was coined from the word herpetology, the study of reptiles and amphibians (which, in turn, has Greek roots: Herpeton means "creeping thing" or "reptile").
This word is commonly used by herpetoculturists (keepers and/or breeders of reptiles and amphibians, see Herpetoculture), particularly on the Internet, but is still considered an amateur, slang word by many herpetologists.
MSN Encarta - Dictionary - herpetology. Encarta® World English Dictionary [North American Edition] © & (P)2004 Microsoft Corporation. (http://encarta.msn.com/dictionary_/herpetology.html)