The hard part of a skeleton; also used in cooking and anatomy.
The dog is gnawing on a bone.
This fish has a lot of bones.
laborious; troublesome; difficult
Used as an adjectival noun (often with な) to describe a task that requires great effort or is hard to accomplish.
This work is laborious.
That is a difficult problem.
I carefully removed the bones from the fish.
He broke a bone in his leg skiing.
Drinking milk regularly makes your bones strong.
This task is quite a chore.
He's a person who spares no effort in his work.