Having the texture or appearance of leather that's what leathery mean.
Leathery fruit is often dry and very chewy, as if chewing leather.
Leathery shells = Hard shells
No, they are usually hard-shelled. Snakes eggs are leathery.
I suspect they think you have leathery skin. Do you have really tan skin? Do you spend a lot of time in the sun or tanning bed? That is when people get skin that looks leathery.
Their eggs are leathery so they can get out of their shells easily
A lot of people at my age have leathery skin, but I don't.
Fish have slimy, leathery skin. An example of a fish with slimy, leathery skin would be the a sea cucumber.
they have leathery eyelids to protect their eyes from the harsh sand storms.
celery
The rough, thick, and leathery meningeal layer is the dura mater.
That is correct. The platypus's bill is not hard like the beak of a duck or any other bird. It is flexible, and made out of a leathery skin, so it feels soft and leathery to the touch.
The leathery shell of a reptile egg is to simply protect the eggs from any predators.