dihedrals
Two-plane meeting angles
Dihedrals are angles formed where two planes meet, like the angle between two faces of a crystal or the upward angle of an aircraft's wings relative to its body.
In aviation, wing dihedral provides stability—when the plane tilts, the lower wing generates more lift, automatically correcting the roll.
Climbers use the term for V-shaped rock formations where two cliff faces intersect: She jammed her body into the dihedral and chimneyed up.
Point where edges converge
- edgeBoundary or sharpness
- facetPlane on cut stone
- polyhedronMulti-faced geometric solid
- tetrahedronFour-faced polyhedron
octahedron · icosahedron · dodecahedron · cube · polygon · solid · three-dimensional · convex
Ordered-atom solid
- latticeOpenwork of crossed strips
- quartzCrystalline silicon dioxide
- calciteCrystalline calcium carbonate
- pyriteBrass-yellow iron sulfide
gypsum · halite · mineralogy · cleavage · twinning · symmetry · facet · structure
vertex
Point where edges converge
- edgeBoundary or sharpness
- facetPlane on cut stone
- polyhedronMulti-faced geometric solid
tetrahedron · octahedron · icosahedron · dodecahedron · cube · polygon · solid · three-dimensional · convex · concave
crystal
Ordered-atom solid
- latticeOpenwork of crossed strips
- quartzCrystalline silicon dioxide
- calciteCrystalline calcium carbonate
pyrite · gypsum · halite · mineralogy · cleavage · twinning · symmetry · facet · structure · formation
crack
Narrow break or attempt
- stemmingRoot-form reduction process
- techniqueSkilled way of performing
- jammingBlocking or wedging forcefully
layback · corner · open book · chimney · footwork · rock face · granite · sandstone · protection · cam
wing
Limb enabling flight
- aileronWing-mounted roll control
- airfoilLift-generating curved surface
- liftMechanism for vertical transport
drag · bank · roll · sideslip · glide · stability · control · angle of attack · flight · aerodynamics