The act or an instance of becoming open or being made to open:
(Geology) The opening of a volcano in the earth's crust.
A narrow notch, groove, or opening, as a keyway in a piece of machinery, a slit for a coin in a vending machine, etc.
A similar opening in rock or other substances
The mouth of a river where it flows into a larger body of water.
The opening through which a container is filled or emptied.
An entrance, opening, or passage
An opening or perforation:
Find another word for orifices. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for orifices, like: openings, vents, slots, slits, pores, outlets, mouths, inlets and holes.