Eiffel uses a precisely defined terminology. That terminology sometimes sounds strange to programmers used to other languages, but it's only because (1) there has been a systematic effort to classify object-oriented concepts in a logical way; (2) some of the terms predate terminology that is used in other languages. You will see, however, that behind every choice of term there is a carefully devised rationale.
The new, community-based Eiffel glossary has been moved and is now available at http://www.eiffelroom.org/glossary
Also, there is a glossary of Eiffel terminology for .NET developers available at http://docs.eiffel.com/eiffelstudio/technologies/dotnet/eiffel_dotnet_language/10_conventions/10_terminology.html