What is the definition for the Zakat animal known as *Jadh'ah*?

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The *Jadh'ah* is a female camel that has completed four years of age and entered its fifth year. It is named as such because its lower incisor tooth would fall out (*tajdha'u*). This is the highest age category required for Zakat liability on camels, which is due specifically when the total number of camels ranges from sixty-one to seventy-five.