Something that can be spread easily, like butter or jam.
Spreadable things are usually soft and easy to move around.
Examples:
Butter is spreadable on bread.
The cheese is not spreadable because it's too hard.
I like to eat spreadable things on my toast.
Is the peanut butter spreadable or not?
Her laughter was so spreadable, everyone started laughing too.
The rumor was so spreadable that everyone in town heard it.