General words:
* Auto (from "autos" meaning "self") - automobile, automatic, autobiography
* Cosmos (from "kosmos" meaning "order, universe") - cosmopolitan, cosmic
* Crisis (from "krisis" meaning "decision, turning point") - critical, criticize
* Democracy (from "demos" meaning "people" and "kratos" meaning "power") - democratic, democrat
* Eidos (from "eidos" meaning "form, appearance") - ideology, iconoclast
* Ethos (from "ethos" meaning "character, custom") - ethical, etiquette
* Gymnasium (from "gymnos" meaning "naked") - gym, gymnast
* Helios (from "helios" meaning "sun") - heliocentric, heliotrope
* Kratos (from "kratos" meaning "power") - bureaucracy, aristocracy
* Logos (from "logos" meaning "word, reason") - dialogue, prologue
* Megalos (from "megalos" meaning "great") - megaphone, megalomania
* Mythos (from "mythos" meaning "story") - mythology, mythical
* Oikos (from "oikos" meaning "house, home") - economy, ecology
* Pan (from "pan" meaning "all") - panorama, pandemic
* Psyche (from "psyche" meaning "soul, mind") - psychology, psychiatrist
* Sceptos (from "sceptos" meaning "doubt") - skepticism, sceptic
* Techne (from "techne" meaning "art, skill") - technology, technician
* Theos (from "theos" meaning "god") - theology, atheist
Medical terms:
* Anemia (from "an" meaning "without" and "haima" meaning "blood")
* Arthritis (from "arthron" meaning "joint" and "itis" meaning "inflammation")
* Bronchitis (from "bronchos" meaning "windpipe" and "itis" meaning "inflammation")
* Cardiac (from "kardia" meaning "heart")
* Diagnosis (from "dia" meaning "through" and "gnosis" meaning "knowledge")
* Hepatitis (from "hepar" meaning "liver" and "itis" meaning "inflammation")
* Neural (from "neuron" meaning "nerve")
* Osteoporosis (from "osteon" meaning "bone" and "porosis" meaning "porous")
* Pneumonia (from "pneumon" meaning "lung" and "itis" meaning "inflammation")
Science terms:
* Atom (from "atomos" meaning "indivisible")
* Catalyst (from "kata" meaning "down" and "lyein" meaning "to loose")
* Chromosome (from "chroma" meaning "color" and "soma" meaning "body")
* Dioxide (from "di" meaning "two" and "oxide" meaning "oxygen compound")
* Hypotheses (from "hypo" meaning "under" and "thesis" meaning "placing")
* Mitochondria (from "mitos" meaning "thread" and "chondrion" meaning "granule")
* Nucleus (from "nucleus" meaning "kernel")
* Photosynthesis (from "phos" meaning "light" and "synthesis" meaning "putting together")
* Thermodynamics (from "therme" meaning "heat" and "dynamis" meaning "power")
This is just a small sampling of the many Greek words that have found their way into the English language. The influence of ancient Greek culture is evident in many aspects of our vocabulary and understanding of the world.