EXCLAVE
Etymology
Noun
exclave (plural exclaves)
A portion of a country's territory not connected to the main part
(medicine, rare) A detached part of an organ, as of the pancreas, thyroid, or other gland.
Source: Wiktionary
Ex*clave", n. Etym: [Formed fr. enclave by substitution of ex- for
en-]
Definition: A portion of a country which is separated from the main part
and surrounded by politically alien territory. [Recent.]
Note: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition