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Definition of CEREBRAL HEMISPHERE. : either of the two hollow convoluted lateral halves of the cerebrum â see brain illustration.
right brain; right hemisphere (the cerebral hemisphere to the right of the corpus callosum that controls the left half of the body). Holonyms (hemisphere is a part of...): cerebrum (anterior portion of the brain consisting of two hemispheres; dominant part of the brain in humans).eural structure (a structure that is part of the nervous system). Hyponyms (each of the following is a kind of hemisphere): left brain; left hemisphere (the cerebral hemisphere to the left of the corpus callosum that controls the right half of the body).