n. the part of the skull that encloses the brain. Syn. -- cranium, brainpan. [ WordNet 1.5 ]
n. 1. rapid fluctuations of voltage between parts of the brain. Syn. -- brain wave, cortical potential. [ WordNet 1.5 ]
2. the clear (and often sudden) understanding of a complex situation. Syn. -- insight, brainstorm. [ WordNet 1.5 ]