Do we say placebo or nocebo

placebo 2 occurrences

antifebrile [Med.], antipoison^, counterpoison^, antitoxin, antispasmodic; bracer, faith cure, placebo; helminthagogue^, lithagogue^, pick-meup, stimulant, tonic; vermifuge, prophylactic, corrective, restorative; sedative &c 174; palliative; febrifuge; alterant^, alterative; specific; antiseptic, emetic, analgesic, pain-killer, antitussive

incense, honeyed words, flummery; bunkum, buncombe; blarney, placebo, butter; soft soap, soft sawder^; rose water.

nocebo 0 occurrences

Do we say   placebo   or  nocebo