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The following 3 entries include the term organ pipe.
organ pipe cactus
noun: any of several tall upright cacti (such as Sternocereus thurberi) of the southwestern U.S. and adjacent Mexico that usually branch at the base to form several upright stems
organ-pipe coral
noun: an alcyonarian coral of the genus Tubipora having a usually red or purple skeleton consisting of a mass of parallel cylindrical tubes united at intervals by horizontal plates and being found in tropical parts of the Indian ocean and the Pacific ocean
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Merriam-Webster unabridged
