viscus

n. any of the internal organs of the body (especially in the abdominal cavity, i.e. the intestines)

In anatomy, a viscus (plural: viscera ) is an internal organ of an animal (including humans), in particular an internal organ of the thorax or abdomen. The viscera, when removed from a butchered animal, are known collectively as offal. Internal organs are also known as "innards", or less formally, "guts" (which may also refer to the gastrointestinal tract).
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Viscus /vis·cus/ pl. vis´cera [L.] any large interior organ in any of the three great body cavities, especially those in the abdomen. viscus pl. [more]Viscus - Community and Resources

Noun
1. a main organ that is situated inside the body
(synonym) internal organ
(hypernym) organ
(hyponym) viscera, entrails, innards

(n.)
One of the organs, as the brain, heart, or stomach, in the great cavities of the body of an animal; -- especially used in the plural, and applied to the organs contained in the abdomen.