This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

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.

"He spoke in the bantering tone which had become the habitual expression of his tenderness; but his eyes softened as they absorbed in a last glance the glimmering submarine light of the ancient grove, through which Undine's figure wavered nereid-like above him."

nereides   

wood nymph    ever-receding    fisher-boy    sea-foam    weatherworn    annalist    merman    naiad    oomph    cold-water