[count] 1 a : a part of the body (such as the heart or liver) that has a particular function
▪ internal organs ▪ vital organs ▪ an organ transplant/donor — see also sense organ
b — used as a polite way of saying penis ▪ the male organ 2 a : a musical instrument that has a keyboard and pipes of different lengths and that makes sound by pushing air through the pipes —called also pipe organ; — see picture at keyboard
b : an electronic musical instrument that has a keyboard and makes sounds like those of an organ — see also barrel organ, mouth organ 3 formal : a group or organization that has a special function within a larger organization
▪ the legislative organ of our government 4 formal : a newspaper, magazine, etc., that is published by a particular group and that gives the news and opinions of that group
▪ The magazine functions as the official organ of the tobacco industry. ▪ a house organ [=a publication that expresses the opinions of a business or group]