spadix

noun2

1. •
   A fleshy spike (inflorescence) with reduced flowers, usually enclosed by a spathe, characteristic of aroids.

   • The spadix of this plant is frequently quite white, or coloured, and the leaves liable to be streaked with white, and to have black, or scarlet blotches on them. — 1789
2. •
   A male sexual organ of certain cephalopods and hydrozoans (especially the nautilus), used to transfer sperm.

   • However, the shells of modern nautiluses show the opposite pattern—males are somewhat larger than females, with a wider aperture to accommodate the spadix. — 2017