"Internal combustion engine" means any engine in which power, produced by heat or pressure or both, is developed in the engine cylinder(s) by burning a mixture of air and fuel and is subsequently converted to mechanical work by means of one or more pistons.
N.H. Admin. Code § Env-A 1302.22
(See Revision Note at chapter heading for Env-A 1300) #9803, eff 10-31-10