ocelli

/OW0 CH EH1 L IY0/
noun
  1. 1

    A simple eye consisting of a single lens and a small number of sensory cells.

  2. 2

    An eyelike marking in the form of a spot or ring of colour, as on the wing of a butterfly or the tail of a peacock.

Source: https://en.wiktionary.org/wiki/ocelli, https://en.wiktionary.org/wiki/ocellus