(In ants with workers of different types) a subcaste composed of the largest workers, having large heads and frequently functioning for defence; such a worker, especially a soldier ant.
Origin
Mid 19th century.
Definition of worker major in US English:
worker major
noun
Entomology
(In ants with workers of different types) a subcaste composed of the largest workers, having large heads and frequently functioning for defence; such a worker, especially a soldier ant.