Concavity is a related term of orifice.
As nouns the difference between concavity and orifice
is that concavity is (uncountable) the state of being concave while orifice is a mouth or aperture, as of a tube, pipe, etc; an opening; as,.
concavity
English
Noun
(uncountable) The state of being concave
(countable) A concave structure or surface
Antonyms
* convexity
orifice
English
Noun
(
en noun)
A mouth or aperture, as of a tube, pipe, etc.; an opening; as,
* the orifice of an artery or vein
* the orifice of a wound