A flattened forward-facing part of the head as characteristic of many owls, often seen as a well-defined radial arrangement of feathers around the eyes.
Origin
Early 19th century.
Definition of facial disc in US English:
facial disc
(USfacial disk)
noun
A flattened forward-facing part of the head as characteristic of many owls, often seen as a well-defined radial arrangement of feathers around the eyes.