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.
骨 is the bone itself, while 関節 is the connecting point where two bones meet and move.
big-boned; sturdily built; stout · solid; robust; well-constructed
skeletal frame; skeleton; build; physique · framework; frame; structure · outline
cheekbone; zygomatic bone
framework of a building; foundation · mainstay; backbone; supporting pillar
small bones; fine bones
hipbone; innominate bone · fortitude; perseverance; backbone
flesh and bones; body and soul
work hard; take pains; exert oneself
effort; trouble; pains
backbone (of a fish)
umbrella frame; umbrella ribs
large bone; thick bone
thin inner ribs of a folding fan
tooth; gums
worry; care; anxiety
rib
outer ribs of a folding fan · outer frame of a lattice door
scapula; shoulder blade
bone radical (left side)