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Ob Oc Od Ol Om Op Or Os Ot Ov Ox
Ora Orb Org Ori

Orifice

/ˈôrəfis/

Noun, pl. orifices

1. A mouth or aperture, as of a tube, pipe, etc.; an opening. (wiktionary.org)

2. An opening through which something may pass. (merriam-webster.com)

3. An opening or aperture; any external opening in the body of an animal. (biology-online.org)

4. An aperture or hole that opens into a bodily cavity. (wordnetweb.princeton.edu)

Word origin: From Middle French orifice “the opening of a wound” and directly from Latin orificium “an opening,” literally “mouth-making,” from os , “mouth” + facere “make.”

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