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The page below is a sample from the LabCE course Medical Terminology in the Histology Laboratory. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Medical Terminology in the Histology Laboratory (online CE course) »
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Directions and Positions

PrefixMeaningExample
Ab-Away fromAbsorb
Ad-Toward or take inAdsorb
Ecto- or Exo-OutsideEctopic, exocrine
Endo-WithinEndoscopy
Epi- UponEpithelium
Infra-Positioned below or underInfrapatellar
Ipsi-SameIpsilateral
Meso-MiddleMesothelial
Meta- After or beyondMetastasis
Peri-Around or surroundingPericardium
Retro-BehindRetroverted
Trans-Across or throughTransvaginal