a part of a structure having some specific characteristic or function | the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals |
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 | |