noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A fir.
2. 2
   The root of a very-high-temperature turbine blade, inserted into a corresponding slot in a disc, resembling in section a simplified image of a fir.

Etymology

From fir + tree.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.