Dictionary.com
definitions

stalling angle

noun Aeronautics.

critical angle(def 2).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for stalling angle

stalling angle

noun

the angle between the chord line of an aerofoil and the undisturbed relative airflow at which stalling occursAlso called: stall angle, critical angle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012