anti-what?

[Verbivore]

In recent years it seems that the term for an antidote to venomous bites has emerged as anti-venom. In the past, the term I was familiar with was anti-venine (emphasis on the ~ine, pronounced ~een).

Now I find, in a news report, the term anti-venin. Is this:

• a spelling variant (also possibly a pronunciation variant) of anti-venine,
  
• a hybrid of anti-venine and anti-venom, or
  
• a neologism?
  

Do we have a literate toxicologist in the house?

[Dave M]

First off, I'll admit I'd never heard of any of those words (the UK seems such a boringly safe place for wildlife ...).

However, a search of the on-line dictionaries and a wider search just via Google suggest that:
(1) anti-venin is the normal form, "sometimes" written as anti-venen or anti-venine
(2) an ant-venin is a thing in itself (like an antibody) - it is not something which is "anti" to venin.

[Alan Palmer]

I think I'm fairly literate but I'm certainly not a literate toxicologist. I've never heard of the ~ine or ~in versions, only anti-venom. As Dave M indicates, there's luckily not much call for the stuff in the UK. Also, to add to Dave's research, it seems to often be written as one word: antivenine, etc.