What is another word for orifice?

Need synonyms for orifice? Here's a list of similar words from our thesaurus that you can use instead.

A mouth or aperture, such as of a tube, pipe, etc.
“Cayenne keyhole limpets are easily identified due to the keyhole-shaped orifice at the apex of the shell.”
Sunken or decayed area
An opening or entrance to a hollow, concave, or enclosed structure
Each of the upper and lower bony structures in vertebrates forming the framework of the mouth and containing the teeth
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