̷ ̷ˈ ̷ ̷tərəs noun
Usage: capitalized
Etymology: New Latin, from chaet- + -pterus
: a genus (the type of the small family Chaetopteridae) of large marine polychaete worms that inhabit parchmentlike U-shaped tubes open at both ends, are highly bioluminescent, and have one pair of large lateral appendages and several broad fanlike membranous folds by which they maintain a current of water within the tube