Prefix Dictionary – D
Meanings of medical prefixes
EUGENE M. MCCARTHY, PHD
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dacry- or dacryo- [Greek dacron tear] (1) tears (dacryagogue); (2) lacrimal sac (dacryelcosis).
dacryocyst- or dacryocysto- [dacryo + cyst] Denotes the lacrimal sac (dacryocystitis).
dactyl- or dactylo- [Greek dactylos finger] Finger (dactyloid).
de- [Latin de down from, away from, from, off] (1) from (decubital); (2) do the opposite (decomposer); (3) remove, reduce (dehydrate, deoxy-).
deca- [Greek deka ten] Ten (decaliter).
decem- [Latin decem ten] Ten (December).
deci- [Greek deka ten] One tenth (decimorgan).
dem- or demo- [Greek demos populace] people, population (demoid).
demi- [Latin dimidiare to halve] Half (demilune).
dendr- or dendro- [Greek dendron tree] Denotes a tree or treelike thing (Dendrobatidae, dendrochronology, dendrology).
dent- or denti- or dento- [Latin dens, dentis tooth; tooth-like thing] Tooth (dentary, dentulous).
deoxy- [de + oxy-] Containing less oxygen (deoxyribonucleic acid).
der- or dero- [Greek dere neck] Having a neck or throat (or a disease thereof) of the type indicated by the stem or suffix (Derotremata).
derm- or derma- or dermo- or dermat- or dermato- [Greek derma skin] Denotes skin (dermal).
desm- or desmo- [Greek dein to bind] A bond, tie, ligature (desmosome).
dextro- [Latin dexter, dextra right, on the right hand] To the right (dextrocardia, dextrorotatory, dextroversion).
di- or dia- or dis- [Greek dis double, twice] double, twice, two (diploid, diotic).
di- or dia- [Greek dia through, by] (1) through, between (diarrhea, diatom); (2) asunder, apart (diastasis, diastole); (3) completely (diagnosis).
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di- or dif- or dis- [Latin de down from, away from, from, off] Apart, separation, taking apart (dissect).
didym- or didymo- [Greek didymos twin, testis] (1) testis (didymitis); (2) twin (didymus).
dipl- or dipla- or diplo- [Greek diploos twofold, double] Double (diploblastic, diploid, diplophase, diplotene).
dis- [Latin de down from, away from, from, off] (1) negative, not, opposite (disequilibrium); (2) free of, undo (disinfect).
dodec- or dodeca- [Greek dyodeka twelve] Twelve (dodecandrous).
dors- or dorsi- or dorso- [Latin dorsum back] Pertaining to the back, at the back, in back (dorsolateral).
dry- or dryo- [Greek drys tree, oak] Tree, oak (dryopithecine).
dy- or dyo- [Greek dyo two] Two, a pair, in pairs (dyad).
dynam- or dynamo- [Greek dynamis power] Denotes power (dynamometer).
dys- [Greek dys- bad, abnormal, difficult, defective] (1) abnormal (dysplasia); (2) impaired (dysneuria); (3) difficult (dyspnea); (4) bad (dyspepsia, dysentery).
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