1.
Something that is ~ will kill you or make you ill if you swallow or absorb it.
...a large cloud of ~ gas.
ADJ
2.
An animal that is ~ produces a poison that will kill you or make you ill if the animal bites you.
There are hundreds of ~ spiders and snakes.
ADJ
3.
If you describe something as ~, you mean that it is extremely unpleasant and likely to spoil or destroy a good relationship or situation.
...~ comments.
ADJ: usu ADJ n