[ 'kʌnstəb(ə)l , 'kɒn- ]
■ noun
1》 Brit. a police officer.
↘(also police ~ ) a police officer of the lowest rank.
2》 the governor of a royal castle.
↘ historical the highest-ranking official in a royal household.
Origin
ME: from OFr. conestable , from late L. comes stabuli 'count (head officer) of the stable'.