What is the longest word in the english language?

[eppie]

It's a chemical compound, not a medical term, although I have no clue what it is... also if it is acceptable, then I gues there would be longer ones also.
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It is a "chemical compound"....to be more clear, by the looks of it is a peptide. (so biological even)

Oops I just saw Walkiry's reply.

Anyway, I don't know if you can call something like this a word. You just name all the amino acids in a peptide (protein) and put them in a row. I mean if you want you can also give the chemical name of each of your DNA molecules.....but that would not make sense. (and you would need a bloody good computer)
To go on to the next bit:

jeunemaitre
I guess this is what happens when some organic chemist decides he wants to feel important.

You are wrong here. An organic chemist tries to gives these things a trival name, he would never use a word like this "to look cool".
Plus, an organic chemist IS important...not like a bank director or so, but real important. :)

Anyway, to make things easy organic chemist like to give molecules that are much and much smaller already trivial names....when talking about them.
The words people use in commercials are NOT trvila names, they are BS names.
(like wrinklegoaway-a-tine and so).

Apparently the oilfields of venezuala consist of one big polymer (they have to cut it to put it in barrels) .....try naming that one.