The word concave means curving in or hollowed inward, as opposed to convex. The former may be used in reference to:
- Concave lens, a lens with inward-curving (concave) surfaces
- Concave polygon, a polygon which is not convex
- Concave function, a type of function which is related to convex functions
- In addition, the term concave upwards is used for convex functions, and concave downwards for concave functions.
- Concave mirror
- Concave set
- Concave football boot, a football boot company
Famous quotes containing the word concave:
“I think he is not a pick-purse nor a horse-stealer, but
for his verity in love, I do think him as concave as a covered goblet or a worm-eaten nut.”
—William Shakespeare (1564–1616)