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Related to internal organ: kidney
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|Noun||1.||internal organ - a main organ that is situated inside the body|
organ - a fully differentiated structural and functional unit in an animal that is specialized for some particular function
entrails, innards, viscera - internal organs collectively (especially those in the abdominal cavity); "`viscera' is the plural form of `viscus'"
excretory organ, urinary organ - an organ that separates waste substances from the blood and discharges them
liver - large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes
ticker, heart, pump - the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body; "he stood still, his heart thumping wildly"
stomach, tum, tummy, breadbasket - an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion
respiratory organ - any organ involved in the process of respiration
hindgut - the caudal part of the alimentary canal in vertebrate embryos