The vitreous humour can be found in a human eye. It is the clear gel between the lens and the retina of a human eyeball. It is sometimes call the vitreous body.

I think this is probably the aqueous humour, which is a thick watery substance behind the cornea but in front of the lens.

It is called the vitreous humor. The word humor here has nothing to do with comedy. The word can mean 'body fluid', from the Latin for body fluid, 'umor'.

No, it's filled with a liquid called aqueous humour and vitreous humour.

The gel that is inside the eyeball is called "vitreous humour".