siphuncle
noun
si·phun·cle
ˈsīˌfəŋkel
plural -s
1
a
: 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
Word History
Etymology
New Latin siphunculus, from Latin, little pipe, diminutive of sipho, siphon siphon