an enclosed compartment from which a vessel can be navigated | a part of a structure having some specific characteristic or function |
one's area of interest or expertise | the extent of a 2-dimensional surface enclosed within a boundary |
| a part of an animal that has a special function or is supplied by a given artery or nerve |
| a subject of study |
| a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography) |
| a particular environment or walk of life |