'Rocky Mountain bristlecone pine' definitions:

Definition of 'Rocky Mountain bristlecone pine'

(from WordNet)
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 [syn: bristlecone pine, Rocky Mountain bristlecone pine, Pinus aristata]