AC(O)U-

EX: acoustics, paracusia, acoumetry

ACR-

EX: acrobat, acrostic

ACTIN-

EX: actinobiology, actinodromous, actinodermatitis

ADEN-

EX: adenoid, lymphadenitis, ectadenia

AESTHE-, ESTHE-

EX: aesthete, anesthetic

AGOG(UE)-

EX: demagogic, synagogue

AGON-

EX: agony, protagonist

ALG-

EX: neuralgia, nostalgia

ALL-

EX: allegory, parallel

ANDR-

EX: androgenic, philander

ANGEL-

EX: angelic

ANGI-

EX: cholangiotomy, sporangium, angiitis

ANTH-

EX: chrysanthemom, anthology, anthophilous

ANTHROP-

EX: anthropology, philanthropy

ARCHA(E)-, ARCHE-

EZ: achaeology, Archeozoic

ARTHR-

EX: arthritis, arthropod, anarthia

AST(E)R-

EX: astronomy, asterisk, disaster

AUT-

EX: automobile, automatic

BALL-, BOL-, BLE-

EX: ballistics, symbol, emblem, problem

BAR-

EX: barometer, barograph

BI-

EX: biology, biography

BIBLI

EX: bibliography

BLAST-

EX: blastomere, blastula, myoblast

BRACHY-

EX: brachyglossal, brachypodous, brachylogy

BRADY-

EX: bradycardia, bradylogia, bradykinesia

CAC-

EX: cacogenics, cacophony

CAL(L)-, KAL(L)-

EX: calisthenics, kaleidoscope

CANON

EX: canon

CARDI-

EX: electrocardiogram, cardiologist, pericardium

CARP-

EX: amphicarpous, carpolith, angiocarp

CAU(S)-

EX: cauterize

CENTR-

EX: concentric

CEPHAL-

EX: mesocephalic, cephalopod, electroencephalograph, archencephalon

CH(E)IR-

EX: chiropractor

CHLOR-

EX: chlorophyll, achlorhydria

CHOL(E)-

EX: cholangitis, cholelith, cholagogue, choleric

CHONDR-

EX: hypochondriac, chondrocyte, synchondrosis

CHORE-

EX: chorus

CHROM(AT)-

EX: chromosome, chromatic

CHRON-

EX: chronic, chronicles

CLA-

EX: iconoclast

COCC(US)-

EX: pentacoccous, streptococcus, meningococcemia

COSM-

EX: cosmic, cosmetic

CRI-

EX: critic, crisis, endocrine

CYAN-

EX: cyanophil, anthocyanin, cyanide

CYCL-

EX: bicycle, tricycle, cyclical

CYST-

EX: cholecystitis, cystolithiasis, cystectomy, statocyst

CYT-

EX: cytology, hemocytozoan, anisocytosis

D(A)EMON-

EX: demon

DACTYL-

EX: dactylosymphysis, hexadactylism, brachydactyly

DEC-

EX: decathlon, decaliter

DEM-

EX: democracy, demagogue

DENDR-

EX: dendrolatry, dendron, philodendron

DERM(AT)-

EX: apidermis, pachyderm, dermatologist, dermatitis

DEUTER-

EX: deuterogamy, deuteragonist

DI-, DIPL-

EX: dioxide, diploma

DICH-

EX: dichogomy

DO-

EX: dose, antidote

DOLICH-

EX: dolichofacial, dolichomorphic

DOX-, DOG-

EX: heterdox, orthodox, dogma

DROM-

EX: hippodrome, dromomania, homodromy

DYN(AM)-

EX: dynasty, dynamic, dynamo

EGO-

EX: egotism, egoism

ENTER-

EX: dysentery, archenteron, exenterate

ER(OT)-

EX: erotic

ERG-, URG-

EX: erg, energy, metallurgy

ERYTHR-

EX: erythrocyte, erythrophilous, hemoerythrin

ETHN-

EX: ethnology, ethnogrophy

EURY(S)-

EX: eurybaric, eurycephalic

GAM-

EX: bigamy, polygamy

GASTR-

EX: gastric, gastrointestinal

GE-

EX: geography, geology

GEN(E)-

EX: genealogy

GEN(E)-, GON-

EX: hydrogen, genesis, gene, theogeny

GER(ONT)-

EX: geriatric, gerontocracy

GLOSS-, GLOT(T)-

EX: glossary

GLYPH-

EX: hieroglyphic, triglyph

GNO(S)-

EX: gnomic, diagnosis

GON-

EX: archegonium, gonorrhea, gonoblast

GON-

EX: pentagon, trigonometry

GYMN-

EX: gymnasium, gymnorhinal, gymnanthous

GYN(E)-, GYN(A)EC-

EX: gynarchy, gynecology

HECT-

EX: hectograph

HELI-

EX: helium, heliocentric

HEM(AT)-, (HAEM(AT)-

EX: hemorrhage, hemoglobin, hematology, leukemia

NOTE: This base usually appears as EM- if preceded by a prefix or another base; e.g., anemia, leukemia

HEMER-

EX: ephemeral, Decameron

HEMI-

EX: hemisphere

HEPAT-

EX: hepatomegaly, hepatization, hepatica

HEPT(A)-

EX: heptamerous

HETER-

EX: heterogenerous, heterosexual

HEX(A)-

EX: hexagonal

HIER-

EX: hieroglyphic, hieratic

HIPP-

EX: hippopotamus, hippodrome

HIST(I)-

EX: histamine, histometaplastic, histozoic

HOL-

EX: holocaust

HOM(E)-

homogenized, homosexual, homeopathy

HYDR-

EX: hydroelectric, hydraulic

HYGR-

EX: hygroscope, hygrophyte, euryhygric

HYSTER-

EX: hysterotomy, hysteroepilepsy

IATR-

EX: psychiatric, pediatric

ICHTHY-

EX: ichthyosaur, Chondroichthyes

ICON-

EX: icon

IDE-

EX: ideal, ideation

IDI-

EX: idiot, idiosyncracy

IS-

EX: isomerous, isosceles

KILO-

EX: kilocycle

KINE-, CINE-

EX: kinetic, cinema

LAB-, LEP-, LEM-

EX: syllable, catelepsy, dilemma

LAT(E)R-

EX: idolater, idolatry

LECT-

dialect, analects

LEUC-, LEUK-

EX: leukemia, leukoderma, leucoma

LIP-

EX: lipase, lipophil, lipuria

LITH-, LITE-

EX: lithograph, phonolite

LOG-

EX: apology, epilogue, prologue

NOTE: [LOGUE-] came into English through French.

LY-

EX: analysis, paralysis

MACR-

EX: macron, macrocosm

MANC-, MANT-

EX: bibliomancy, pyromancy, mantic

MAST-, MAZ-

EX: mastectomy, mastoid, mastodon

MEGA(L)-

EX: megaphone, megacycle, megalomania

MELAN-

EX: melanin, melanosis, melangeophilous, Melanesia, melancholy

MENING-

EX: meningoencephalitis, meningomyelitis

MER-

EX: hexamerous, dysmerogenesis, merogony

MES-

EX: Mesopotamia, mesoderm

MICR-

EX: microphone, microscope, microgram

MIM-

EX: mimic

MIS-

EX: misanthrope

MNE-

EX: amnesia

MON-

EX: monotone, monorail

MORPH-

EX: morphology, metamorphosis

MY(S)-, MYOS-

EX: myograph, myomere, amyotaxia, myositis

MYC(ET)-

EX: mycology, mycotrophic, Aureomycin, Chloromycetin, neomycin

MYEL-

EX: poliomyelitis, myelocyte, myelencephalon

NAUT-

EX: nautical, Argonaut

NE-

EX: neon, neoclassical, Neoplatonism

NECR-

EX: necrosis, necropolis

NEPHR-

EX: nephritis, pronephros, nephrolith

NES-

EX: Indonesia, Melanesia

NEUR-

EX: neuralgia, neurosis, neuropsychiatry, neurosurgery

OCT(A)-

EX: octopus, octane, octagonal

OD-

EX: ode

OD-, HOD-

EX: odometer, electrode, cathode

ODONT-

EX: orthodontia, mastodon

OLIG-

EX: oligarchy

ONYM-

EX: anonymous, synonym

OO-

EX: ootheca, oosphere, oophoritis

OP(T)-

EX: aptic, autopsy

OPHTHALM-

EX: ophthalmia, ophthalmologist, photophthalmia

ORA-

EX: panorama

ORNIS-, ORNITH-

EX: ornithophilous, archaeornis, ichthyornis

ORTH-

EX: orthodox

OST(E)-

EX: osteopath, osteotome, acrostealgia

OT-

EX: otoscope, otorrhea, dichotic

P(A)ED-

EX: pediatrition

PAL(A)E-

paleontology, paleography

PAN(T)-

EX: Pan-American, panorama, pantomime

PATH-

EX: sympathy, telepathy, pathology

PATR-

EX: patriot, patristic

PATRI-

EX: patriarch

PEDIA-

EX: encyclopedia

PENT(A)-

EX: pentathlon, pentagon, Pentecost

PEP(T)-

EX: peptic, pepsin

PETR-

EX: petrify, petroleum

PHA(N)-

EX: phantom, epiphany, phase, emphasis, fantasy

PHAG-

EX: sarcophagus, geophagy, glossophagine

PHE(M)-, PHA-

EX: prophet, aphasia

PHER-, PHOR-

EX: periphery, semaphore, phosphorescent

PHIL-

EX: philharmonic, philosophy

PHLEB-

EX: phlebectomy, phlebosclerosis

PHON-

EX: phonetic, telephone

PHOT-

EX: photograph, photosynthesis

PHRA-

EX: phrase, phraseology

PHREN-

EX: phrenogastric, hebephrenia, bradyphrenia, phrenology

NOTE: frenzy and frantic are also derived from the Greek word phren.

PHY-

EX: neophyte

PHYLL-

EX: chlorophyll, phyllophagus, oligophyllous

PHYSI-

EX: physics, physiology

PLAS(T)-

EX: plasma, encephalodysplasia, arthroplasty, hyperplasia

PLATY-

EX: platyhelminth, platysma, amphiplatyan

PLEG-; PLEX-

EX: paraplegia, diplegia, apoplexy

POD-

EX: podium, tripod

POL(IS)-

EX: politician, policy, Annapolis

POLY-

EX: polyglot, polygamy

PROT-

EX: protoplasm, protein

PSEUD-

EX: pseudoscientific, pseudointellectual

PSYCH-

EX: psychology, psychosis

PTER(YX)-

EX: helicopter, arthropterous, Lepidoptera, coleopterous, ichthyoptertgia

PY-

EX: arthroempyesis, pyogenisis, pyonephritis

PYR-

EX: pyromaniac, pyre

R(R)HIN-

EX: rhinitis, otorhinolaryngologist, rhinoceros, rhinencephalon

SCHIZ-, SCHIS-

EX: schizophrenia, schism

SCLER-

EX: multiple sclerosis, arteriosclerosis, scleometer

SOM(AT)-

EX: chromosome, somatology, merosome

SOPH-

EX: philosophy, sophomore

STA-

EX: static

STEN-

EX: stenography, stenothermic, stenopetalous

STERE-

EX: stereograph, stereopticon

STHEN-

EX: asthenopia, anisosthenic, adenohypersthenia

STOL-, STAL-, STLE-

EX: epistolary, peristalsis, epistle

STOM(AT)-

EX: amphistomous, stomatoplasty, exostome, enterostomy

STROPH-

EX: strophe, catastrophe

TACH(Y)-

EX: tachylogia, tachistoscope

TACT-, TAX-

EX: tactics, taxonomy, taxidermy

TAPH-

EX: cenotaph, epitaph

TAUT-

EX: tautology, tautomerous

TECHN-

EX: technical, polytechnic

TELE-

EX: telephone, telegraph

TETR(A)-

EX: tetrathyl

THANAT-, THANAS-

EX: thanatopsis

THE-

EX: tesis, theme, synthetic

THE-

EX: theology, monotheism

THEC(A)-

EX: bibliotheca, amphithecium, pterotheca, neurothecitis

THERM-

EX: thermometer, thermodynamics

THROMB-

EX: thrombin, thromboangiitis

THYM-

EX: dysthymia, hyperepithymia, prothymia

TOM-

EX: atom, anatomy

TON(US)-

EX: tonic, ophthalmotonometer, angiohypertonia, peritonitis

TOP-

EX: topic, utopia

TOX-

EX: intoxicate, toxin, antitoxin, zootoxin

TRI-

EX: tripod, tricycle

TROP-

EX: tropic, phototropic

TROPH-

EX: atrophy

TYP-

EX: typographical, typical

UR-

EX: melanuria, dysuria

XEN-

EX: xenogamy

XYL-

EX: xylophone, xylocarp, xylophyte

ZO-

EX: zoology