# convexity

The quality of something being round or curved in shape is its convexity. You could describe the convexity of a round, squat vase.

The noun convexity is somewhat technical for everyday use — you're more likely to see it in a math textbook than to hear a friend use it to talk about a goldfish bowl. Still, it is a perfectly good way to describe anything that curves or bulges outward, whether it's the belly of a Chinese Buddha or a balloon. Convexity comes from the adjective convex, with its Latin root word convexus, "vaulted or arched."

Definitions of convexity
1

### n the property possessed by a convex shape

Synonyms:
convexness
Types:
bulginess, roundedness
the property possessed by a rounded convexity
ellipticity, oblateness
the property possessed by a round shape that is flattened at the poles
Type of:
configuration, conformation, contour, form, shape
any spatial attributes (especially as defined by outline)

### n a shape that curves or bulges outward

Synonyms:
convex shape
Types:
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umbo
a slight rounded elevation where the malleus attaches to the eardrum
camber
a slight convexity (as of the surface of a road)
entasis
a slight convexity in the shaft of a column; compensates for the illusion of concavity that viewers experience when the sides are perfectly straight
knob, node, thickening
any thickened enlargement
ridge
any long raised strip
peak, point, tip
a V shape
taper
a convex shape that narrows toward a point
projection
any solid convex shape that juts out from something
widow's peak
a V-shaped point in the hairline in the middle of the forehead
raphe, rhaphe
a ridge that forms a seam between two parts
cusp
small elevation on the grinding surface of a tooth
salient
(military) the part of the line of battle that projects closest to the enemy
jag
a sharp projection on an edge or surface
bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling
something that bulges out or is protuberant or projects from its surroundings
corrugation
a ridge on a corrugated surface
acantha, spine, spur
any sharply pointed projection
tail, tail end
any projection that resembles the tail of an animal
knife, tongue
any long thin projection that is transient
keel
a projection or ridge that suggests a keel