exuberant: [15] Exuberant comes via French from the present participle of Latin exūberāre ‘be abundant’. This was a compound verb formed from the intensive prefix ex- and ūberāre ‘be productive’, a derivative of ūber ‘fertile’. This in turn was an adjectival use of the noun ūber ‘udder’, which came from the same ultimate source (Indo-European *ūdhr-) as English udder. => udder[exuberant etymology, exuberant origin, 英语词源]