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controllable-pitch

[kuh n-troh-luh-buh l-pich]
adjective
  1. (of a marine or aircraft propeller) having blades whose pitch can be changed during navigation or flight; variable-pitch.
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Origin of controllable-pitch

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018