What is the precise weight represented by the term 'nawah' (date-seed) concerning the dower (mahr)?

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Some scholars state that the weight of the *nawah* is five dirhams, which equals three and a half mithqals of gold. However, Al-Mubarrid states that the correct understanding among Arabic scholars is that one should simply say 'nawah,' as the term itself is a name for five dirhams, analogous to the *uqiyyah* being forty dirhams and the *nish* being twenty dirhams.