- 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.
Meaning of 'pressor' (Princeton's WordNet)
1 . pressor
[ a]
Meaning (1): - increasing (or tending to increase) blood pressure