Definition of bluebush

  1. 1 :  a Mexican shrub (Ceanothus coeruleus) bearing a profusion of blue flowers

  2. 2 Australia :  any of various plants: such as a :  a tomentose saltbush (Kochia pyramidata) with short linear leaves b :  a wattle (Aracia brachybotrya) with rather broad phyllodia and linear to narrowly elliptical pods

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