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blue spruce

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noun
  1. a spruce, Picea pungens, of western North America, having bluish-green leaves, grown as an ornamental: the state tree of Colorado and Utah.
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Origin of blue spruce

An Americanism dating back to 1880–85
Also called Colorado blue spruce, Colorado spruce.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for blue spruce

blue spruce

noun
  1. a spruce tree, Picea pungens glauca, native to the Rocky Mountains of North America, having blue-green needle-like leavesAlso called: balsam spruce
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012