spadix noun. ['speɪdɪks] Pl. -dices [-dɪsi:z], -dixes. M18.
[Latin, lit. 'palm branch with its fruit', from Greek.]
1. Botany. A form of spike which has the flowers arranged on a thick fleshy axis and is usu. enclosed in a spathe, characteristic esp. of the arums. M18.

2. Zoology. In various invertebrates, an organ or part of more or less conical shape. L19.

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