Webster's English Dictionary

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acacia

aca.cia \*-'ka--sh*\ n [NL, genus name, fr. L, acacia tree, fr. Gk akakia 
   shittah] 1: any of a genus (Acacia) of woody leguminous plants of warm 
   regions havin g the leaves pinnate or reduced to phyllodes, having white or 
   yellow flower clusters, and including some that yield gums or tanning 
   extracts 2: GUM ARABIC