mainlander

Short definition from Wiktionary

Noun

1. 1
   Someone who lives on the mainland.
2. 2
   A person from mainland China, as opposed to someone from Hong Kong, Macau or Taiwan.
3. 3
   Someone who lives in mainland Europe, as opposed to the British Isles.

Proper noun

1. 1
   Alternative letter-case form of mainlander (“a person from mainland China”).