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plural spadixes or spadices
(botany) A fleshy spike (inflorescence) with reduced flowers, usually enclosed by a spathe, characteristic of aroids. quotations examples
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, Erasmus Darwin, The Loves of the Plants, J. Johnson, page 148
(zoology) A male sexual organ of certain cephalopods and hydrozoans (especially the nautilus), used to transfer sperm. quotations
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, Danna Staaf, Squid Empire, ForeEdge, page 57