| 单词 | podion | 
| 释义 | podionn. Zoology. rare. Now disused.   = podium n. 3. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > 			[noun]		 > member of > parts of > ambulacrum > ambulacral tube podion1858 pedicel1883 tube-foot1888 1858    R. G. Mayne Expos. Lexicon Med. Sci. 		(1860)	 989/2  				Podion, podium, applied by Illiger to the junction of the toes at the extremity of the tarsus, upon which the leg rests in birds; to the inferior part of the limb, comprehending, before, the carpus, metacarpus, and toes; behind, the tarsus, metatarsus, and toes in the Mammifera. 1900    E. R. Lankester Treat. Zool.  iii. 291  				Water from the reservoir or ampulla is driven into the podion, and the tube-foot is thus rendered tense and rigid. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < | 
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