Webster’s Revised Unabridged Dictionary · 1913
Exclave
Ex·clave′ (ĕks·klāv′), n. [Formed fr. enclave by substitution of ex- for en-] A portion of a country which is separated from the main part and surrounded by politically alien territory. [Recent.]
☞ The same territory is an enclave in respect to the surrounding country and an exclave with respect to the country to which it is politically attached.