骨 — meaning in English

gū

English meaning

bone noun One of the hard, calcium-rich pieces that make up the skeleton of humans and most animals.
domino noun A small rectangular tile marked with dots, used in the game of dominoes.
os noun In anatomy, a bone, or an opening shaped like a mouth — most commonly the opening at either end of the cervix.

骨 is used for these senses in English:

bone (uncountable) A composite material consisting largely of calcium phosphate and collagen and making up the skeleton of most vertebrates.
domino (dominoes) A tile divided into two squares, each having 0 to 6 (or sometimes more) dots or pips (as in dice), used in the game of dominoes. [from c. 1800]
fly in the ointment (idiomatic) Something (especially a minor thing) which ruins or spoils everything else, or makes it less pleasant; a nuisance or problem; a disagreeable or unpleasant detail.

noun One of the hard, calcium-rich pieces that make up the skeleton of humans and most animals.
noun An off-white color resembling the shade of bone.
verb To remove the bones from meat or fish before cooking.

noun A small rectangular tile marked with dots, used in the game of dominoes.
noun A masquerade costume made up of a hooded cloak and a mask covering the upper face.