Dihedral

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Dihedral angle is the upward angle from horizontal of the wings or tailplane of a fixed-wing aircraft. "Anhedral angle" is the name given to negative dihedral angle, that is, when there is a downward angle from horizontal of the wings or tailplane of a fixed-wing aircraft.

Excerpt from the Wikipedia article “Dihedral (aeronautics)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Steelpillow, CC BY-SA 3.0, via Wikimedia Commons.