clavi- clav- (key)

1. A country, or part of a country, that is lying wholly within the boundaries of another country: "An enclave of a country may have boundaries, making it clear that it is a distinct or a separate and different part from the larger territory that surrounds it."
2. A distinctly bounded area of a minority group living together within but apart from another culture which is enclosed within the larger unit: "There are several ethnic enclaves in the city; for example, China Town is an enclave in New York City and San Francisco."

"Many elderly people are living out their golden years in enclaves of retirement communities."

3. A place or a group which is different in character from those surrounding it: "The computer programmers in the company have their own enclave."

That part of a country that is isolated from the main part and is surrounded by foreign or by politically alien territory: "An exclave is viewed from the position of the home country or countries."

"Alaska is an example of an exclave in that it is separated from the rest of the United States of America and West Berlin was once an exclave of West German because it was in former East Germany."

A male-only meeting or group: "There are still many menclaves in the world that exist without female participants."

Situated under the clavicle or located under the collarbone clavicle (an elongated, slender, curved bone situated horizontally at the root of the neck, in the upper part of the thorax); such as, the subclavian vein, subclavian arteries, subclavian nerve, or subclavian muscle.