1. An oval region of the cerebral cortex overlying the extreme capsule, lateral to the lenticular nucleus, buried in the depth of the fissura lateralis cerebri (sylvian fissure).
2. A pyramid-shaped area of the brain within each cerebral hemisphere beneath parts of the frontal and temporal lobes. (medical-dictionary.thefreedictionary.com)
Synonym: insular area, insular cortex, island of Reil. (biology-online.org)
3. A region of the brain deep in the cerebral cortex. (Google Dictionary)
4. Any circumscribed body or patch on the skin. (biology-online.org)
Word origin: Latin word for “island”