Acrospire



the first sprout appearing in the germination of grain; the developed plumule of the seed.
Historical Examples

By about the eighth day of flooring the acrospire should be about three-quarters up the corn.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 4 Various

The malting, however, is complete before the acrospire becomes a leaf.
A Dictionary of Arts, Manufactures and Mines Andrew Ure

As the acrospire creeps along the surface of the seed, the farina within undergoes a remarkable alteration.
A Dictionary of Arts, Manufactures and Mines Andrew Ure

noun
the first shoot developing from the plumule of a germinating grain seed

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