siphuncle

/S AY1 F AH1 NG K AH0 L/
noun
  1. 1

    A strand of tissue passing longitudinally through the shell of a cephalopod, used primarily in emptying water from new chambers as the shell grows.

  2. 2

    A nectary.

Source: https://en.wiktionary.org/wiki/siphuncle