Definitions

1. noun

A coniferous tree, especially one of the species of the genera Pinus or Abies, that lives for hundreds or even thousands of years.

“The bristlecone pine in the forest is estimated to be over 3,000 years old.”

2. noun

The woody cones of these trees, especially when fossilized and used as a measure of time.

“The bristlecone found in the rock formation helped scientists date the layer.”