The part of Asia south of the Himalayas which forms a peninsula extending into the Indian Ocean, between the Arabian Sea and the Bay of Bengal. Historically forming the whole territory of greater India, the region is now divided between India, Pakistan, and Bangladesh.
Definition of Indian subcontinent in US English:
Indian subcontinent
proper noun
The part of Asia south of the Himalayas that forms a peninsula, which extends into the Indian Ocean between the Arabian Sea and the Bay of Bengal. Historically forming the whole territory of greater India, the region is now divided among India, Pakistan, and Bangladesh.