Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: organe, from Latin, from Greek organon 'tool, instrument'

organ

noun
     
or‧gan W3 [countable]
1

body part

a) HB a part of the body, such as the heart or lungs, that has a particular purposeCOLLOCATIONS COLLOCATIONS
internal organs vital organs (=most important organs for life, for example the heart and brain) sexual/reproductive/sex organs organ transplant (=an operation to put an organ from one person's body into another's) organ donor (=someone who gives an organ for an organ transplant)
the liver, heart, and other internal organs
loss of blood flow to his vital organs
Extra doses of the hormone caused the animals' reproductive organs to develop sooner than usual.
In Arizona, 480 people are waiting for organ transplants.
dying people who have agreed to be organ donors
b) HB a penis - used because you want to avoid saying this directly
2

musical instrument

RRC
a) also pipe organ a large musical instrument used especially in churches, with keys like a piano and large pipes that air passes through to produce the sound
b) an electronic musical instrument that produces music similar to a pipe organ, but that does not have pipes:
an electronic organ
3

organization

formal an organization that is part of, or works for, a larger organization or group
organ of
The courts are organs of government.
the decision-making organs
4

newspaper/magazine

formalTCN a newspaper or magazine which gives information, news etc for an organization or group
organ of
the official organ of the Communist Party

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