This is a riddle with a twist. Almost all the lines will point you in the right direction, but hidden somewhere in the riddle is a red herring. If you find the right solution, I'll accept your answer, ...
I guess as an addendum to The Longest Word Made from Chemical Symbols
What is the longest word in the ENGLISH language that can be formed by combining chemical symbols and has no repeat elements in ...
To answer this riddle, solve each of the four lines independently and put all the clues together to get a one-word final answer.
Nonsensical abstraction high up in the army;
The woman with the wheel ...
Your roommate is on vacation, and you need to get something off his laptop. You ring him up, asking if you can borrow his computer.
"Sure, if you can get in," he replies.
"What? But it's your laptop!...
I'm a length of hard wood
Hooped with iron at each end
Used for making a block
Or a case to defend
My sound is like silence:
Dumb, irrelevant am I
Talk about me forever
For I point to the sky