A suture between parts of the epicranium of an insect's head; specifically a group of such sutures shaped like an inverted letter Y, present in certain adult insects.
Origin
Mid 19th century.
Definition of epicranial suture in US English:
epicranial suture
noun
Entomology
A suture between parts of the epicranium of an insect's head; specifically a group of such sutures shaped like an inverted letter Y, present in certain adult insects.