Cecil Moore wrote:

But its propagation speed will be slower than it would be if the wire
were straight. don't know if that qualifies it for a "slow wave" line
or not.

A velocity factor of 0.0175 for a 75m bugcatcher seems to qualify.

I guess this depends on the official definition if "slow wave". It
may already be taken for something specific and limited. It may be
something like high frequency has come to mean an arbitrary frequency
band. This group is the first place I have come across the term.