Medical Definition of port
: an opening, passage, or channel through which something can be introduced into the body: asa: a small medical device (as of plastic or titanium) that is implanted below the skin, is attached to a catheter typically inserted into a blood vessel, and has a small opening through which a needle can be inserted to administer fluids or drugs or withdraw bloodb: an incision (as one made between intercostal spaces) for passing a medical instrument (as an endoscope) into the body
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