1
a
: a differentiated structure (such as a heart, kidney, leaf, or stem) consisting of cells and tissues and performing some specific function in an organism
b
: bodily parts performing a function or cooperating in an activity
the eyes and related structures that make up the visual organs
2
a(1)
: a keyboard instrument in which sets of pipes are sounded by compressed air and produce a variety of timbres
called also pipe organ
(2)
: an electronic keyboard instrument that approximates the sounds and resources of the pipe organ
(3)
(4)
: any of various similar cruder instruments
b
3
: a subordinate group or organization that performs specialized functions
the various organs of government
4
variants
or organo-
1
: organ
organogenesis
2
: organic
organophosphorus
Cite this Entry
“Organ.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/organ. Accessed 4 Sep. 2026.
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