| central gyrus | (n) either of two gyri on either side of the central sulcus |
| cingulate gyrus | (n) a long curved structure on the medial surface of the cerebral hemispheres; the cortical part of the limbic system, Syn. gyrus cinguli |
| frontal gyrus | (n) any of the convolutions of the outer surface of the frontal lobe of the cerebrum |
| gyrus | (n) a convex fold or elevation in the surface of the brain, Syn. convolution |
| occipital gyrus | (n) any of the convolutions of the outer surface of the occipital lobe of the cerebrum |
| parietal gyrus | (n) any of the convolutions of the outer surface of the parietal lobe of the cerebrum |
| postcentral gyrus | (n) the convolution of parietal lobe that is bounded in front by the central sulcus |
| precentral gyrus | (n) the convolution of the frontal lobe that is bounded in back by the central sulcus and that contains the motor area |
| temporal gyrus | (n) any of the convolutions of the outer surface of the temporal lobe of the cerebrum |
| broca's area | (n) the motor speech center in the left hemisphere of the brain in most people, Syn. convolution of Broca, Broca's gyrus, Broca's center, Broca's convolution |
| mercury | (n) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures, Syn. atomic number 80, quicksilver, hydrargyrum, Hg |