Can someone please explain how "lampost" is an acceptable abbreviation for "lamp post"?

I questioned this on Facebook after seeing the strange-looking "lampost" there. Is it a post for a lam, or an ost for a lamp? Remember, if there is only one "p" it can only belong to "lamp" OR "post", one or the other. Not both. So what is a lampost? Is it a post for a lam, or an ost for a lamp? LOGICAL ANSWERS ONLY, PLEASE.

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MrPerditus1 · 61-69, M

Well, if you want a logical answer, then it's simple. Whom ever wrote it, forgot to put a p in there. There is no lam for a post or a lamp that needs an ost. It's called a typo.