1) (Hindu and Buddhist mythology) Half-human, half-serpent water spirits. Guardians of raindrops, pearls, or the elixir of immortality. Associated with Varuna, the god of Justice.

1) (Classical mythology) Any of the 50 daughters of Nereus (a sea god, the son of Pontus and Gaia).
2) A sea nymph.

1) (Astronomy) A star that suddenly becomes thousands of times brighter, and then gradually fades back to its original intensity.

1) The 13th letter of the Greek alphabet.