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oral cavity
Also known as the buccal cavity,oropharynx and glossopharyngeal cavity
stoma/o, stomy, or oro (oral cavity, also common)
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The Latin term used in medicine is "per os" which means literally "by mouth". It is usually abbreviated as PO or p.o.
Other medical terms used for by mouth are: orally, oral administration, and simply: by mouth.
A related term, NPO, stands for "nil per os" which means "nothing by mouth". This is often used in relationship to preparation for testing or surgery when you need to be fasting before the procedure or lab.
Perioral or circumoral is the medical term for around the mouth.
Oral or buccal can both be used to describe the mouth. For instance the mouth itself can be called the oral cavity or the buccal cavity. If you are talking about the space just around the mouth it would be perioral.
Ingestion
Eating is "ingestion"; chewing is "mastication"; swallowing is "peristalsis."
Oral. The combining form or/o means mouth and the suffix -al means pertaining to. When reading medical terminology, you start from the suffic then to the word root.
Phagia is the term used to describe eating, it can also be combined as in polyphagia (increased eating).