History
History
Synonyms
UK
US
Meaning:
basin

a bowl used for preparing or serving food

container or area where water is held

chord

a straight line that joins two points on the circumference of a circle or the ends of an arc

arched, rounded line or object

curve

a line of which no part is straight, e.g. part of the edge of a circle

arched, rounded line or object

dimple

a small natural hollow in the chin or cheek e.g. when a person smiles

indentation

hyperbola

a curve of two equal parts formed by cutting through both bases of a double cone

arched, rounded line or object

parabola

a flat curve formed by cutting a cone along a line parallel to its side

arched, rounded line or object

sag

to sink or curve under weight or pressure; to become lower; drop

drop, decline

CONCAVITY as in Wiktionary
CONCAVITY as in Wikipedia