jellyfishes

Noun

jellyfish (countable and uncountable, plural jellyfish or jellyfishes)

1. An almost transparent aquatic animal; any one of the acalephs, especially one of the larger species, having a jellylike appearance.
   • A recent study focused on the enzymatic and cytotoxic functions of jellyfish metalloproteases and identified diverse proteolytic effects including gelatinolytic, caseinolytic, and fibrinolytic activities.2015 June 18, Mahdokht Jouiaei et al., “Ancient Venom Systems: A Review on Cnidaria Toxins”, in Toxins, volume 7, →DOI

   Synonyms:

   jelly, sea jelly

   1. 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.
   2. (especially) The medusa phase of these animals rather than a younger life stage.
   3. A ctenophore, a member of the phylum Ctenophora (comb jellies).
2. 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.