Definition of ocellus in English:



  • 1

    another term for simple eye
    • ‘Our recent experiments raise a new question about the evolutionary relationship of ocelli to other sensory structures.’
    • ‘Between the compound eyes are usually three simple eye, or ocelli.’
    • ‘The ocelli, or eye spots, may reduce damage from fin-biting predators by mimicking the head.’
    • ‘The expression in adults was observed in dorsal ocelli cells in the nerve code.’
    • ‘The ocelli (eye-like spots) on the spinous dorsal fin of males are metallic blue, surrounded by a golden ring.’
  • 2

    another term for eyespot (sense 1, ocellus sense 2)
    • ‘They suggested that the color change is stimulated by perception of the background color by the larval ocelli and effected by a neurophysiological pathway.’
    • ‘Besides functioning as an identification feature, the ocelli also have anti-predator functions.’
    • ‘Transverse cuticular wrinkles arranged in a tight parallel pattern form a ring posterior to the ocelli and encircle about 25% of the cephalothorax.’


Early 19th century: from Latin, diminutive of oculus ‘eye’.