
Louis P. answered 11/11/20
Lover of Literature
Although the word is used twice, it may still be a typo as a result of editing error.
It may also be a writing error resulting from Kerouac's misreading of the term. Or, going through various metallurgy results it is most likely a stainless steel or aluminum alloy. That still leaves the question unanswered though doesn't it :-) ?
So to take it a step further, did the shopkeeper tell Ray, "Here's a nice polybdenum bottle?" Or did Ray decide for himself that "Hey man that's one beautiful popybdenum bottle."
Take your pick.