WordNet (r) 3.0 (2006):

coaxial cable
    n 1: a transmission line for high-frequency signals [syn:
         coaxial cable, coax, coax cable]

The Free On-line Dictionary of Computing (30 December 2018):

coaxial cable
coax

    A kind of cable with a solid central conductor
   surrounded by insulator, in turn surrounded by a cylindrical
   shield woven from fine wires.  It is used to carry high
   frequency signals such as video or radio.  The shield is
   usually connected to electrical ground to reduce electrical
   interference.

   (1995-03-28)