I can't find the definition of ナマ.
closed as unclear what you're asking by snailboat♦ Nov 17 '14 at 5:52
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It's impossible to give a definitive answer, given the total absence of context, but なま basically means "raw", as in なまざかな. However, it has a whole range of extended meanings: the two I think of first with 挨拶 are the "live" in "live broadcast", or the なま in なまの声, meaning "without a microphone". Or again, it might mean something like "unrehearsed" or "impromptu".