- a type of simple eye common to invertebrates, consisting of retinal cells, pigments, and nerve fibers.
- an eyelike spot, as on a peacock feather.
- the simple eye of insects and some other invertebrates, consisting basically of light-sensitive cells
- any eyelike marking in animals, such as the eyespot on the tail feather of a peacock
- botany
- an enlarged discoloured cell in a leaf
- a swelling on the sporangium of certain fungi
