A-/ An
Away from, negative, without (Afebrile - without fever)
Ab-
Away from (Abnormal - not normal)
Ante-
before (Antecubital - before elbow)
Anti-
against (Anticoagulant - delay/prevent blood)
Auto-
self (Autogenous - self-producing)
Bi-
twice, double (Bicuspid - two cusps)
Circum-
around (Circumocular - surrounding eye)
De-
down or from (Decapitation - separate head from bone shaft)
Dys-
difficult, painful or bad (Dysfunctional - not working properly)
Ecto-
outside (Ectoplasm - outermost layer of cell protoplasm)
Endo-
within (Endoscopy - explore inside body w endoscope)
Epi-
upon, over, at, in addition to, after (Epigastrium -over pit of stomach)
Eu-
well, easy, or good (Eupnea - easy/normal breathing)
Ex-
out, away from, or completely (Excise - cut out, remove surgically)
Exo-
with-out, inside of (Exogenous (originating outside an organ or part)
Extra-
on the outside, beyond (Extracranial - outside of skull)
Hemi-
half (Hemicolectomy - removal of half or less of colon)
Hydro-
relating to water (Hydrocephalus - increased accumulation of fluid in brain ventricles)
Hyper-
over, above, or increased (Hypertension - higher than normal blood pressure)
Hypo-
below, under, or decreased (Hypotension - lower thatn normal blood pressure)
Inter-
between or among (Interstitial - between parts of tissue, not within)
Intra-
meaning within or inside (Intramuscular - within muscle)
Olig/o
few, scant, or little (Oliguria - scanty, infrequent urination)
Para-
beside, along side of (Parahepatic - adjacent, alongside liver)
Peri-
around (Periauricular - around ear)
Poly-
many (Polyuria - excessive, frequent urination)
Post-
after (Postanesthetic - period following anesthesia)
Pre-
before (Prenatal - before birth)
Retro-
behind or backwards (Retrobulbar - behind eyeball)
Semi-
Half (Semiconscious - half conscious)
Sub-
under, less, or below (Subcostal - below rib(s)
Super- and Supra-
Both mean above, beyond, or through (Supracostal - above, outside rib(s)
Trans-
Across,over,beyond, or through (Transurethral - through urethra)
Ad
toward (Addiction - drawn toward dependence)