part of part of organ body of tubeworm trophosome A specialised organ found in deep-sea tube worms populating hydrothermal vent environments that is colonised by chemosynthetic bacteria which supply the host worm with organic compounds. The term may be applied to similar organs in other worms[ENVO:01000165]. UBERON:0012644 An organ of dark green-brown spongy tissue in a tubeworm which is a host to symbiotic microbes.