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acrospire

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ac⋅ro⋅spire

[ak-ruh-spahyuhr]
–noun Botany.
the first sprout appearing in the germination of grain; the developed plumule of the seed.

Origin:
1610–20; acro- + spire 1 ; r. akerspire, equiv. to aker (OE æchir ear of grain) + spire
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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