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acrospire (s) (noun)
, acrospires (pl)
The first shoot at the end of a germinating seed: An acrospire appears from the plumule of a sprouting grain seed.
, acrospires; acrospired; acrospiring
To put forth or give life to the first sprout: Chuck watched the spiral primary buds of his germinating grain seeds acrospire from the soil in his field.