any of the structural elements forming the compound eye of an insect, many crustaceans, etc.: each element is a complete photoreceptor in itself, having a lens, pigment, light-sensitive cells, etc.
Origin of ommatidiumModL, diminutive from Classical Greek omma (gen. ommatos), the eye, akin to ?ps, eye
One of the optical units, consisting of photoreceptors and usually one or more lenses, that make up a compound eye of an insect or a crustacean.
Origin of ommatidiumNew Latin diminutive of Greek omma ommat- eye ; see okw- in Indo-European roots.
From the stem form of Ancient Greek á½„Î¼Î¼Î± (omma, “eye") + -idium.