This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
穖 combines 禾 (grain) with 幾, which likely contributes sound. The exact historical meaning is uncertain.
With 禾 (grain) beside 幾, picture a rare grain that is hard to identify. Its meaning remains uncertain, like a mysterious crop.
For キ, imagine a key (キー) that unlocks the mystery of this rare grain: key -> キ.
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