WordNet is a kind of online English language database. The words are grouped into synonyms and definitions are provided. One could say WordNet combines a dictionary and thesaurus.

Someone who works to protect the environment from destruction or pollution. (WordNet)

Christiane Fellbaum has written:

'WordNet'

"paradigm, epitome, image."

From Babylon, a computer program. More exactly, from WordNet 2.0.

'Adios amigos' is Spanish for 'Goodbye my friends' or 'goodbye friends.'