What does the word "pararail" mean? I would like to know the meaning. Search over web does not help much.
If this was a quiz show and you had one guess, the safest offering may be 'The suspension system in a vintage Scorpion snowmobile", BUT
"Para rail" and "pararail" are 'made up' words usually used as product names and/or trademarks for a range of things by a range of manufacturers over a range of years.
Google's ngram viewer swears it does not know the word - usually a goodish sign that a term is a specialist one.
Here are some of the available "pararails":
Steyr AUG Rifle foward grip slide pararail - the slide rail mid picture.
Guess: Paratroop rail
Pararail suspension on a vintage scorpion snowmobile
Same name same type of product different company.
Pararail rooftop fall protection system
Guess: Parapet rail