Real Dictionary

intestine
a small simple room, as in a prison, convent, or monastery; cubicle [...]
an animal tissue consisting of one or more layers of closely packed cells covering the external and internal surfaces of the body. The cells vary in structure according to their function, which may be protective, secretory, or absorptive [...]
an extended area, as of land [...]
anything serving to obstruct passage or to maintain separation, such as a fence or gate [...]
microfauna and microflora, esp of a specific epoch, habitat, or region [...]
the part of the alimentary canal between the stomach and the anus [...]
the state or quality of being permeable [...]
countable noun: Your intestines are the tubes in your body through which food passes when it has left your stomach.

intestine in American English
internal, with regard to a country or community; domestic; civil
the lower part of the alimentary canal, extending from the stomach to the anus and consisting of the small intestine and the large intestine; bowel(s): food passes from the stomach into the small intestine for further digestion
adjective: internal; domestic; civil
noun: the lower part of the alimentary canal, extending from the pylorus to the anus

intestine in British English
noun: the part of the alimentary canal between the stomach and the anus