A rice plant 禾 as plump as a pregnant belly 乃 is excellent. (乃 is considered a pregnancy belly because it is used in pregnent 怀孕 [huái yùn] where a child comes out of it).
Shows a pregnancy belly in a side view - The meaning of this radical is based on 孕 (yùn), which means: "pregnancy". It is read such that the child 子 comes out of the womb 乃.
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