Tervikvahemik
Tervikvahemik is a term that does not have a widely accepted definition in standard reference works. In Estonian-language sources, it appears infrequently and without clear context, and there is no general agreement on its meaning across disciplines. Because the word does not appear in major dictionaries or encyclopedias, any explanation is speculative.
A plausible approach is to treat it as a compound Estonian neologism formed from root elements that
In practice, if you encountered tervikvahemik in a text, the intended meaning would be best understood from
See also: Estonian language compounds; glossary of chemistry terms; language neologisms.
Notes: If you have a specific source or field where the term is used, providing that would