porting

1. gerundparticiplepresentpresent participle and gerund of port

plural portings

1. An opening through or into which fluid or other material can flow.

   […] portings distributed radially about the housing bore. It then is necessary only to arrange six equally spaced portings at the outside diameter of the control sleeve which rotates within the housing, and to size these portings […]

   1961, SAE Technical Paper Series (issues 391-420)

   1 more example

   […] portings in said tracer valve to said cylinder inlet port in said servo valve unit for actuating said servo valve member from said set position to control fluid flow through said inlet and outlet portings in said servo valve unit […]

   1962, Official Gazette of the United States Patent Office, page 1224