noun, plural spadices [spey-dahy-seez, spey-duh-seez] . Botany.
an inflorescence consisting of a spike with a fleshy or thickened axis, usually enclosed in a spathe.

1750–60; < Latin spādīx a broken palm branch and its fruit < Greek spā́dīx a torn-off palm bough, chestnut brown; akin to spân to tear off Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spadix (ˈspeɪdɪks)
n , pl spadices
a racemose inflorescence having many small sessile flowers borne on a fleshy stem, the whole usually being surrounded by a spathe: typical of aroid plants
[C18: from Latin: pulled-off branch of a palm, with its fruit, from Greek: torn-off frond; related to Greek span to pull off]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
spadix   (spā'dĭks)  Pronunciation Key 
Plural spadices (spā'dĭ-sēz')
A fleshy spike of minute flowers, usually enclosed within a spathe, as in the arums.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The inflorescence is the flowering part of the plant, and consists of a central
  shaft called a spadix.
At first hidden inside the spathe, the spadix is revealed as the entire
  structure swells.
At first hidden inside, the spadix grows in size and then becomes revealed as
  the entire inflorescence swells.
The spadix is spherical or football-shaped with many densely-packed flowers.
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