Noun, pl. orae serratae
1. The serrated junction between the retina and the ciliary body. This junction marks the transition from the simple non-photosensitive area of the retina to the complex, multi-layered photosensitive region. In animals in which the region does not have a serrated appearance, it is called the ora ciliaris retinae. (wikipedia.org)
2. The serrated extremity of the optic part of the retina, located a little behind the ciliary body and marking the limits of the percipient portion of the membrane. (biology-online.org)
3. The dentate border of the retina. (merriam-webster.com)
Word origin: From Latin words ora, “margin,” and serra, “saw”