noun a concave shape or surface
adjective having a surface that curves inward
In geometry, a concave shape has at least one interior angle greater than 180 degrees.
In economics, a concave production function shows diminishing returns to scale.
In optics, a concave lens is thinner at the center than at the edges, causing light rays to diverge.
In biology, concave is used to describe the shape of certain structures like the concave shape of a bird's beak.
In art and design, concave shapes are often used to create depth and perspective in images and sculptures.
In writing, 'concave' may be used to describe a character's inwardly curved personality or a storyline that takes a negative turn.
Psychologists may use 'concave' to describe a patient's inwardly focused thoughts or emotions.
In architecture, 'concave' may refer to a surface that curves inward, such as the interior of a dome or arch.
Mathematicians may use 'concave' to describe a function or shape that curves inward, with no portion of the curve lying above a chord connecting two points on the curve.
Surgeons may use 'concave' to describe a certain type of incision or curvature in a bone or organ during a procedure.