claw [klɔ:]

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n.爪，钩，抓伤；vi./vt.用爪抓，搔，搜刮

one of the sharp curved nails at the end of each of the toes of some animals and birds

What is the function of a cat's claw? 猫爪的作用是什么？
A hen's claw has three toes. 母鸡的脚爪有三个脚趾。