Cydippida is a term used to refer to a particular group of jellyfish that belong to the phylum Ctenophora. These organisms are characterized by their comb-like cilia that they use for propulsion in the water. While there are not many synonyms for the term Cydippida, it is occasionally referred to as the "comb-jellies". This name reflects the unique feature of these creatures - their cilia arranged in rows, which resemble a comb. Another potential synonym is "ctenophores", which is the name of the phylum that includes the Cydippida. Regardless of the name, these creatures are fascinating and important members of aquatic ecosystems.