Noah Webster's Dictionary (n.) One who, or that which, waters.

Multi-Version Concordance Waterer (2 Occurrences) 1 Corinthians 3:7 So that neither the planter nor the waterer is of any importance. God who gives the increase is all in all. (WEY BBE DBY) 1 Corinthians 3:8 Now in aim and purpose the planter and the waterer are one; and yet each will receive his own special reward, answering to his own special work. (WEY BBE DBY)