one part or member of a pair, a group, or a set of something or some people / one of the bodies resulted from the split of another one into many parts / one part or fragment of something broken

katana (Japanese traditional sword) / blade

a small stone or pebble, especially one used for throwing

the philosopher's stone

(medicine) doctor

will (intention or decision)

intention; intent; purpose; mind; a wish

(physics) a neutron

(astronomy) a neutron star

a head as hard as a stone / stubbornness and inflexibility / an inflexible person