Adverb
rectally (not comparable)
Through the rectum.
The thermometer had to be inserted rectally.
Fever itself is not life-threatening unless it is extremely and persistently high, such as greater than 107 F (41.6 C) when measured rectally. Source: Internet
If you took the alcohol rectally however, it would take just seconds to go from a normal state to a legally intoxicated state — without the ability to vomit or rid your body of some of the excess (vomiting usually occurs between 0.10 to 0.15 percent). Source: Internet
Occult bleeding has many of the same causes as other forms of more rapid gastrointestinal bleeding, such as (passage of red blood and/or rectally) and melena (black tarry stool as a result of bleeding from the upper such as ulcers). Source: Internet