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dihedral

noun
di·​he·​dral | \ (ˌ)dī-ˈhē-drəl How to pronounce dihedral (audio) \

Definition of dihedral

1 : dihedral angle
2 : the angle between an aircraft supporting surface (such as a wing) and a horizontal transverse line

First Known Use of dihedral

circa 1911, in the meaning defined at sense 1

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The first known use of dihedral was circa 1911

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