A ctenophore, a member of the phylum Ctenophora (the comb jellies).
A scyphozoan, a member of the class Scyphozoa (the true jellies).
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.
jewelfish
jewelfish
noun
Any fish in the genus Hemichromis, native to Africa.
