from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of 50 sea nymphs who were attendants upon Poseidon (Neptune), and were represented as riding on sea horses, sometimes in human form and sometimes with the tail of a fish.
- n. A worm of the genus Nereis, having sharp retractable jaws and an annelid body.
From the stem of Latin Nērēis ("sea-nymph"), from Ancient Greek Νηρηΐς, from Νηρεύς ("the sea-god Nereus"). (Wiktionary)