1. (Science: botany) Any coniferous tree of the genus picea, as the Norway spruce (P. Excelsa), and the white and black spruces of America (P. Alba and P. Nigra), besides several others in the far Northwest. See Picea.
Origin: OE. Spruce or Pruse, Prussia, Prussian. So named because it was first known as a native of Prussia, or because its sprouts were used for making, spruce beer. Cf. Spruce beer, below, Spruce.
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... the last few decades of the century. Usnea ("old man's beard") are a type of lichen that grow on the branches of trees (especially spruces) and are very dsitinctive in old forests. These lichens also often disappear close to industrial areas and factories, and slowly re-appear if ...
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