hammer; to hammer into shape; weight (e.g. of a steelyard or balance); to strike with a hammer

to forge (metal); (fig.) to toughen sb up; to hone (one's skills)

malleus or hammer bone of middle ear

a hammerhead shark

manubrium of malleus (handle of hammer bone), connecting ossicles 聽小骨|听小骨 to tympanum 鼓膜