1
[Middle English acacia, acacie "astringent gum made from the juice of green plums or sloes," borrowed from Anglo-French & Medieval Latin; Anglo-French acasie, acacie "juice of plums or sloes," borrowed from Medieval Latin acacia, going back to Latin "gum arabic"]
: gum arabic
2
: any of a large genus (Acacia) of leguminous shrubs and trees of warm regions with leaves pinnate or reduced to phyllodes and white or yellow flower clusters
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Merriam-Webster unabridged
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