Presor or Pressor: How To spell?
The word Presor is misspelled against Pressor, an adjective meaning "Causing, or giving rise to, pressure or to an increase of pressure; as, pressor nerve fibers, stimulation of which excites the vasomotor center, thus causing a stronger contraction of the arteries and consequently an increase of the arterial blood pressure; -- opposed to depressor."
Pressor has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings pre & or which should not be misspelled with single 'S'
Wrong Spelling:  pre-s-or  Correct Spelling:  pre-ss-or 
Find more incorrect spellings of Pressor to spell right way.