rocky mountain bristlecone pine
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(noun) small slow-growing upland pine of western United States (Rocky Mountains) having dense branches with fissured rust-brown bark and short needles in bunches of 5 and thorn-tipped cone scales; among the oldest living things some over 4500 years old. Synonyms: bristlecone pine, Rocky Mountain bristlecone pine, Pinus aristata.
Noun Definition 1