trophosome

 [trof-uh-sohm, troh-fuh-]  

troph·o·some

   [trof-uh-sohm, troh-fuh-]
noun Zoology.
1.
an organ in deep-sea tube worms that is colonized by bacteria supplying the host worm with food and energy.
2.
a similar organ in other marine worms.
Origin:
1865–70; tropho- + -some3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Trophosome is always a great word to know.
So is vertebrate. Does it mean:
having a backbone or spinal column
phylum of worms comprised of parasitic and free-living nonparasitic species
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