1
: hollowed or rounded inward like the inside of a bowl
a concave lens
2
: arched in : curving in
—used of the side of a curve or surface on which neighboring normals to the curve or surface converge and on which lies the chord joining two neighboring points of the curve or surface
Examples of concave in a Sentence
Adjective
a concave lens
Recent Examples on the Web
Rob Reed, Forbes.com, 8 Sep. 2025
The bell and diaphragm devices have a wide, flat side for high frequencies and a smaller, concave side for low frequencies.
—Bestreviews, Mercury News, 8 Sep. 2025
Georgina Jedikovska, Interesting Engineering, 6 Oct. 2025
Returning briefly to the exterior, a new spoiler has been added at the back, inspired by the concave underbelly of a board.
—New Atlas, 14 Sep. 2025
See All Example Sentences for concave
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Adjective
In particular, the concave deck feels a lot like a skateboard and allows for better board feel and control—enabling Payne to do actual kick-flips on the wave.
—Rob Reed, Forbes.com, 8 Sep. 2025
The bell and diaphragm devices have a wide, flat side for high frequencies and a smaller, concave side for low frequencies.
—Bestreviews, Mercury News, 8 Sep. 2025
Noun
According to the firm, the larger prototype includes a 1,485-square-foot (138 square meters) heliostat made of 40 movable mirrors that track the sun and reflect its rays towards a 32-foot-wide (10 meters) concave dish concentrator.
—Georgina Jedikovska, Interesting Engineering, 6 Oct. 2025
Returning briefly to the exterior, a new spoiler has been added at the back, inspired by the concave underbelly of a board.
—New Atlas, 14 Sep. 2025
See All Example Sentences for concave
Cite this Entry
“Concave.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/concave. Accessed 10 Oct. 2025.
Copy CitationMedical Definition
concave
adjective
con·cave
kän-ˈkāv, ˈkän-ˌ 
: hollowed or rounded inward like the inside of a bowl
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