brainwave

World English Dictionary
brainwave (ˈbreɪnˌweɪv)
 
n
informal Also called: brainstorm a sudden inspiration or idea

Collins English Dictionary - Complete & Unabridged 10th Edition
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Brainwave is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
WordNet
brainwave

noun
1. (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph 
2. the clear (and often sudden) understanding of a complex situation [syn: insight
WordNet® 3.0, © 2006 by Princeton University.
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