Rashi on Genesis 41:23/רש"י על בראשית מ״א:כ״ג

1צנמות PARCHED — In Aramaic צונמא signifies a rock. They are like wood without moisture and as hard as a rock. But in the Targum it is translated by נצן לקין “their blossom is stricken” — there was nothing in them but the withered blossom, because they were empty of grain).