40 Greek Root Words in English, With Meanings and Example Words
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Michael Desrosiers
Langclub Co-founder · MA, Johns Hopkins University
A Greek root is the core part of a word that carries its basic meaning. Learn forty of them and you can work out the meaning of thousands of English words you have never seen before, especially in science, medicine, and academic writing.
This page gives you the full reference table, four to five example words for each root, and a reverse lookup so you can search by meaning instead of by root.
Contents
- The 40 most useful Greek roots
- Reverse lookup: find the root by meaning
- How to actually use these
- Why Greek roots matter more than word lists
1. The 40 Most Useful Greek Roots
| Root | Meaning | Example words |
|---|---|---|
| anthrop | human | anthropology, misanthrope, philanthropy, anthropomorphic |
| arch | ruler, chief | monarch, anarchy, architect, patriarch, hierarchy |
| astro, aster | star | astronomy, astronaut, asterisk, disaster, astrophysics |
| auto | self | automatic, autonomy, autobiography, autograph, automobile |
| bibl | book | bibliography, bibliophile, bibliotherapy |
| bio | life | biology, biography, antibiotic, symbiosis, biopsy |
| chrom | colour | chromosome, monochrome, chromatic, polychrome |
| chron | time | chronology, synchronize, chronic, anachronism, chronometer |
| cosm | universe, order | cosmos, cosmopolitan, microcosm, cosmetic |
| crat, cracy | rule, government | democracy, aristocrat, bureaucracy, autocrat, technocracy |
| dem | people | democracy, demographic, epidemic, pandemic, demagogue |
| derm | skin | dermatology, epidermis, hypodermic, taxidermy |
| dyn | power | dynamic, dynamite, dynasty, thermodynamics |
| geo | earth | geography, geology, geometry, geopolitics, geothermal |
| gram | something written | grammar, telegram, diagram, program, epigram |
| graph | to write | autograph, biography, photograph, calligraphy, paragraph |
| hydr | water | hydrate, dehydrated, hydraulic, hydrogen, hydroelectric |
| hyper | over, excessive | hyperactive, hyperbole, hypertension, hyperlink |
| hypo | under, below | hypothesis, hypodermic, hypothermia, hypocrite |
| log, logy | word, study of | dialogue, monologue, biology, logic, apology |
| macro | large | macroeconomics, macrocosm, macroscopic |
| meter, metr | measure | thermometer, diameter, symmetry, geometry, barometer |
| micro | small | microscope, microbe, microwave, microphone, microcosm, microbiology |
| mono | one, single | monopoly, monotone, monologue, monarch, monogamy |
| morph | shape, form | morphology, amorphous, metamorphosis, anthropomorphic |
| neo | new | neolithic, neon, neologism, neoclassical |
| onym | name | synonym, antonym, pseudonym, anonymous, acronym |
| path | feeling, disease | sympathy, empathy, pathology, apathy, psychopath |
| phil | love | philosophy, bibliophile, philanthropy, Anglophile |
| phob | fear | phobia, claustrophobia, xenophobia, arachnophobia |
| phon | sound | telephone, phonetics, symphony, microphone, cacophony |
| photo | light | photograph, photosynthesis, telephoto, photon |
| phys | nature, body | physics, physical, physiology, physician |
| poly | many | polygon, polyglot, monopoly, polytheism, polymer |
| psych | mind, soul | psychology, psychiatry, psychic, psychopath |
| scope | to see, to watch | telescope, microscope, periscope, stethoscope |
| syn, sym | together, with | synonym, symphony, synthesis, symmetry, sympathy |
| tele | far, distant | telephone, television, telescope, telepathy, telegram |
| therm | heat | thermometer, thermal, thermos, hypothermia, thermodynamics |
| thes, thet | to place, to put | thesis, hypothesis, synthesis, antithesis, parenthesis |
2. Reverse Lookup: Find the Root by Meaning
If you know the meaning but not the root, search this list instead. It answers questions in the form "which Greek root means X".
| Meaning | Greek root |
|---|---|
| book | bibl |
| colour | chrom |
| earth | geo |
| fear | phob |
| feeling, disease | path |
| heat | therm |
| human | anthrop |
| large | macro |
| life | bio |
| light | photo |
| love | phil |
| many | poly |
| measure | meter, metr |
| mind, soul | psych |
| name | onym |
| new | neo |
| one, single | mono |
| people | dem |
| power | dyn |
| rule, government | crat, cracy |
| ruler, chief | arch |
| self | auto |
| shape, form | morph |
| skin | derm |
| small | micro |
| sound | phon |
| star | astro, aster |
| time | chron |
| to see, to watch | scope |
| to write | graph |
| together, with | syn, sym |
| universe, order | cosm |
| water | hydr |
| far, distant | tele |
3. How to Actually Use These
Do not memorise the table. Memorising forty roots as a list produces the same result as memorising forty words: you will recognise them on a test and forget them in a month.
Use them as a decoding tool instead. When you meet an unfamiliar word, break it apart before reaching for a dictionary.
chronometer
chron (time) + meter (measure) = a device that measures time
anthropomorphic
anthrop (human) + morph (shape) = given a human shape or human qualities
hypodermic
hypo (under) + derm (skin) = going under the skin
Roots also combine across languages. "Television" is Greek tele (far) joined to Latin vision (seeing). "Automobile" is Greek auto (self) joined to Latin mobilis (movable). English borrows without tidying up afterwards.
A warning. Roots give you the sense of a word, not its exact modern meaning. "Cosmetic" contains cosm (order) because the original sense was arrangement, which will not help you use the word today. Treat the root as a first guess, then confirm it.
4. Why Greek Roots Matter More Than Word Lists
Coverage. Learning one root gives you partial access to dozens of words rather than one. Graph alone appears in autograph, biography, photograph, calligraphy, paragraph, seismograph, and graphite.
Academic and technical English. Medicine, biology, and the physical sciences are built almost entirely on Greek and Latin. Anyone reading academic English without root knowledge is memorising terminology that could have been worked out.
Exam reading under time pressure. In IELTS or TOEFL Reading there is no dictionary and no time to dwell on a single word. A rough decode in two seconds is worth more than a perfect definition you never get to look up.
What roots will not do. They will not help you speak. Recognising chron in a text is passive knowledge, and passive knowledge does not become fluency on its own. That gap closes only through use.
Put the Vocabulary to Work
Words you can decode but never say stay locked in the reading half of your brain. Langclub runs live discussion sessions every day with B2 to C1 speakers from over 140 countries, on topics where academic vocabulary comes up naturally.