a. Helpful. [ Archaic. ] Bp. Hall. [ 1913 Webster ]
n. 1. (Steam Boilers) A vertical water space in a fire box or combustion chamber. [ 1913 Webster ]
2. (Mining) A support for the center of a tunnel. [ 1913 Webster ]
n. (sport) the middle part of a playing field (as in football or lacrosse); as, he ran the kickoff back to midfield. [ WordNet 1.5 ]