gibber

n. [ From Gib to balk. ] A balky horse. Youatt. [ 1913 Webster ]

v. i. [ imp. & p. p. gibbered p. pr. & vb. n. gibbering. ] [ Akin to jabber, and gabble. ] To speak rapidly and inarticulately. Shak.
Syn. -- jabber. [ 1913 Webster ]

n. (Chem.), A plant growth hormone of the gibberellin series (C19H22O6), also called gibberellin A₃. It was first isolated from the fungus Gibberella fujikuroi. It is used to promote the growth of seedlings. See also gibberellin. MI11 [ PJC ]

n. (Chem.), Any of a number plant growth hormones, the first of which was isolated in 1938 from the fungus Gibberella fujikuroi; more than 60 related gibberelins are known. The most important is gibberellin A₃, also called gibberellic acid. They are used in agriculture for promoting plant growth. [ WordNet 1.5 +PJC ]

a. Unmeaning; as, gibberish language. [ 1913 Webster ]