'postcoxal' originates from the Latin prefix 'post-' meaning 'after' combined with 'coxal,' from Latin 'coxa' meaning the hip or basal segment of an insect leg (coxa).

'postcoxal' is a modern compound formed in New Latin/technical English by combining 'post-' + 'coxal' (from Latin 'coxa'); it appears in entomological descriptions as a descriptive anatomical adjective.

Initially it literally meant 'after the coxa'; its usage has remained specialized and continues to mean 'located posterior to the coxa' in anatomical and entomological contexts.