'Three-port' definitions:

Definition of 'Three-port'

From: GCIDE
  • Three-port \Three"-port`\, a. Having three ports; specif.: Designating a type of two-cycle internal-combustion engine in which the mixture enters the crank case through a port uncovered by the piston near the end of its stroke. [Webster 1913 Suppl.] [1913 Webster]