About twenty years ago, I remember attending a seminar where safety people were distinguishing between “poisonous” and “toxic”.
By “poisonous”, its meant that a particular substance kills in very small doses, whereas a “toxic” substance can result in death but at first causes grave illness and damage to the body and there is still chance of remaining alive.
By this measure, snakes such as the olive sea snake are “poisonous” (death can occur within a few minutes of a bite) while rattlesnakes are “toxic” (recovery can occur, but not before grave damage to the body).
Sorry, “it’s meant” (it is meant).
A more common distinction is that venom is injected by a bite or sting, while poison is ingested.