From The Collaborative International Dictionary of English v.0.48:
Exuberant \Ex*u"ber*ant\, a. [L. exuberans, exuberantis, p. pr.
of exuberare to be abundant; ex + uberare to be fruitful, fr.
uber fruitful, fertile, uber udder: cf. F. exub['e]rant. See
Udder.]
Characterized by abundance or superabundance; plenteous;
rich; overflowing; copious or excessive in production; as,
exuberant goodness; an exuberant intellect; exuberant
foliage. "Exuberant spring." --Thomson. -- Ex*u"ber*ant*ly,
adv.
[1913 Webster]