Trimmer
WordNet
noun
(1) Joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc.
(2) Capacitor having variable capacitance; used for making fine adjustments
(3) A machine that trims timber
(4) A worker who thins out and trims trees and shrubs
"Untouched by the pruner's axe"