Answer: gabion

AnswerCrossword Clue
GABIONPier support
gabioncylinder of wickerwork filled with earth, used as a military defense
gabiona basket or cage filled with earth or rocks and used especially in building a support or abutment
gabionmetal cylinder filled with stones and sunk in water, used in laying the foundations of a dam or jetty
gabiona basket of earth or stones used for fortification