• (n.) The sprout at the end of a seed when it begins to germinate; the plumule in germination; -- so called from its spiral form. • (v. i.) To put forth the first sprout.
<botany> The sprout at the end of a seed when it begins to germinate; the plumule in germination; so called from its spiral form. ... (11 Mar 1998) ... 
Ac'ro·spire noun [ Greek ... + ... anything twisted.] (Botany) The sprout at the end of a seed when it begins to germinate; the plumule in germination; -- so called from its spiral form. 
The beginnings of the plant shoot in germinating barley.
The plumule in germinating grain.
acrospire The first shoot or sprout, being spiral, at the end of a germinating seed.
The embryonic barley plant which grows inside the husk during germination.
the first sprout appearing in the germination of grain; the developed plumule of the seed.