Definition of upsprout:
(n) :
A new growth of or on a plant, whether from seed or other parts.
(n) :
A germinated seed, an incipient young plant.
(n) :
An edible variety of such, grown and intended as food; examples include bean, alfalfa, kale, and others.
(n) :
A bean sprout.
(n) :
A Brussels sprout.
(v) :
(horticulture, intransitive) To grow from seed; to germinate.