1. A polyp with tentacles: A dactylozooid, such as a Physalia physalis or "Portuguese Man-of-War", is a large siphonophore which has a bladderlike float that resembles a jellyfish and lives in warm waters. It has a transparent gas-filled float and long stinging, often poisonous appendages that sting with a neurotoxin.
2. A hydroid modified for catching prey, long, with tentacles or short knobs, with or without a mouth: In Jane's biology book, she read about dactylozooids which have the function of protecting the colony and she was astounded that some such creatures didn't even have an oral cavity!