What is to open (the seams of a vessel's planking) for the purpose of calking them. Reeming iron (Naut.), an iron chisel for reeming the seams of planks in calking ships called?

reem — To open (the seams of a vessel's planking) for the purpose of calking them. Reeming iron (Naut.), an iron chisel for reeming the seams of planks in calking ships. (Webster's 1913.)