There is a medical term that implies you are not supposed to eat or drink for about 12 hours before a surgery, and that is 'NPO' or 'Nil Per Os.'
That is not a term that implies you should only be on IV nutrition, however.
Polydipsia (medical) means excessive or abnormal thirst.
Anacusis is the medical term meaning complete deafness.
Syncope is the medical term meaning fainting.
Lamina is the medical term meaning layers.
Sensation is the medical term meaning feeling.
Eructation is the medical term meaning burping.eructation
Atrophy is the medical term meaning shrinking.
Metastasize is the medical term meaning "to spread."
Stasis is the medical term meaning stopping.
Strabismus is the medical term meaning cockeye.
Kyphotic is the medical term meaning humpbacked.
Exacerbation is the medical term meaning worsening.