castrense
military
castro
fort, castle
+
-ense
adjective suffix meaning 'pertaining to'
Castrense means military and can be broken down into castro0 (fort, castle0) + -ense1 (pertaining to1). It refers to something pertaining to military forts or camps.
adjective
- militaryRelating to or characteristic of the military or armed forces.La disciplina castrense es fundamental en el ejército. // Military discipline is fundamental in the army.