nereids

/N IH1 R IY0 IH0 D Z/
noun
  1. 1

    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.

  2. 2

    A worm of the genus Nereis, having sharp retractable jaws and an annelid body.

Source: https://en.wiktionary.org/wiki/nereid, https://en.wiktionary.org/wiki/nereids