[oil] A tarball is a blob of petroleum which has been weathered after floating in the ocean. Tarballs are an aquatic pollutant in most environments, although they can occur naturally and as such are not always associated with oil spills. Tarball concentration and features have been used to assess the extent of oil spills and their compositi...
Found on
http://en.wikipedia.org/wiki/Tarball_(oil)

is a jargon term for a tar archive - a group of files collected together as one.
Found on
https://www.encyclo.co.uk/local/22605
No exact match found.