Definition of siphuncle
1a : a membranous tubular extension of the mantle which runs through the partitions of the chambers to the apex of a shelled cephalopod : siphon b : the shelly structures that are usually funnel-shaped or tubular processes of the septa and that ensheathe and support the cephalopod siphuncle
2 : a cornicle of an aphid
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Origin and Etymology of siphuncle
New Latin siphunculus, from Latin, little pipe, diminutive of sipho, siphon siphon — more at siphon
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