This is the only place in the Torah where the word "Tzenumos" appears. What exactly does it mean?
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Rashi #1: It means bone-dry, without a trace of moisture.
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2.
Rashi #2 (citing Targum Onkelos) and Targum Yonasan: There were only buds with no seeds inside.
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3.
Ramban (citing Targum Onkelos): It means broken up.
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There were some places where there were no grain kernels at all
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and others, where the sheaves were empty (even of chaff).
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