Google is your friend for many cycling terms.
http://www.sheldonbrown.com/glossary.html
http://www.bikewebsite.com/bikeopedia.htm
http://bikecult.com/bikecultbook/glossary_english.html
For some of the BF specific terms...use the search function, lurk here for a bit, or, if all else fails, start a thread and ask about a specific one.
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"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey