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[flaming-tyger.livejournal.com]

palpable-adjective        /ˈpælpəbəl/ Pronunciation Key - Show Spelled Pronunciation[pal-puh-buhl]
readily or plainly seen, heard, perceived, etc.; obvious; evident: a palpable lie; palpable absurdity.
2. capable of being touched or felt; tangible.

http://dictionary.reference.com/browse/palpable

He thought that his palpable heartbeat would give away how incredibly nervous he was.