noun, plural om·ma·tid·i·a [om-uh-tid-ee-uh] /ˌɒm əˈtɪd i ə/. Zoology.
Origin of ommatidium
Examples from the Web for ommatidium
The ommatidium is from the first segregate and consists of few cells.
Each of these facets is the external window of an eye element or ommatidium.Elementary Zoology, Second Edition|Vernon L. Kellogg
The cells of the ommatidium are a good deal larger than the neighbouring common cells of the epidermis.
Ommatidium -ia: one of the elements of which the compound eye is composed.Explanation of Terms Used in Entomology|John. B. Smith
The ommatidium (soft structure beneath the lens-unit of a compound eye) is very simple in both Scorpio and Limulus.