List of medical abbreviations: Latin abbreviations

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Abbrev.MeaningLatin (or New Latin) origin
a.c.Before mealsante cibum
q.o.dEvery other dayquaque otra die
a.m.Morningante meridiem
b.i.d. (or bid)Twice a day/dailybis in die
gtt.Drop(s)gutta(e)
h.Hourhora
h.s.At bedtimehora somni
N.P.ONothing By Mouthnil per os
o.d.Right eyeoculus dexter
o.s.Left eyeoculus sinister
o.u.Both eyesoculus uterque
p.c.After foodpost cibum
p.m.Afternoonpost meridiem
p.o. or poOrallyper os
p.r. or prRectallyper rectum
p.r.n.as neededpro re nata
q.everyquaque
q.2.h.Every two hoursquaque secunda hora
q.4.h.Every four hoursquaque quarta hora
q.6.h.Every six hoursquaque sexta hora
q.8.h.Every eight hoursquaque octava hora
q.d. or qdEvery day/dailyquaque die
q.i.dFour times a dayquater in die
q.h.Every hour, hourlyquaque hora
q.s.A sufficient quantityquantum sufficiat
Rx or Medical Recipe Symbol mod.JPG prescriptionrecipe
Sig. or S.directionssigna
Stat.Immediately, with no delaystatim
t.i.d. or tidThree times a dayter in die
u.d.As directedut dictum