jellyfish

noun6

1. •
   An almost transparent aquatic animal; any one of the acalephs, especially one of the larger species, having a jellylike appearance.

   • There are asexual variants among all sorts of creatures, including jellyfish, dandelions, lichens and lizards. — 2018
2. •
   Any of various species of cnidarians in the subphylum Medusozoa, including box jellyfish (class Cubozoa), true jellyfish (class Scyphozoa), stalked jellyfish (class Staurozoa), and certain hydrozoans.
3. •
   The medusa phase of these animals rather than a younger life stage.
4. •
   A ctenophore, a member of the phylum Ctenophora (comb jellies).
5. •
   Ellipsis of space jellyfish
6. •
   A sudoku technique involving possible cell locations for a digit, or pair, or triple, in uniquely four rows and four columns only. This allows for the elimination of candidates around the grid.