Our problem is that there are very few substances as destructive as basilisk venom, and they're all dangerous to carry around with you.
Goblin-made blades imbibe only that which strengthens them — Harry, that sword's impregnated with basilisk venom!
Harry directed a Stunning Spell toward the masked Death Eater; it missed but nearly hit Neville, who had emerged from nowhere brandishing armfuls of Venomous Tentacula, which looped itself happily around the nearest Death Eater and began reeling him in.
Basilisk venom only has one antidote, and it's incredibly rare — "
There are no more uses of "venom" in the book.
Show samples from other sources
It was a cobra, whose venom could kill a person in minutes.
Paulo Coelho -- The Alchemist
I used elder python venom, straight from the depths of Tartarus.