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Vocabulary: Greek Word Roots

astro (asterisk, astronaut, astronomical, astronomy) earth
auto (autobiography, autograph, automatic, automobile) excessive
therm (hypothermia, thermometer, thermos, thermostat) eye
opt (optic, optical, optician, optometrist) fear
hyper (hyperactive, hyperthermia) heat
geo (geography, geology, geopolitics, geothermal) self
phob (acrophobia, claustrophobia, technophobia) star