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Greek Word Roots

phob (acrophobia, claustrophobia, technophobia) bone
osteo (osteocyte, osteology, osteoporosis, osteosarcoma) contest
gnos (agnostic, diagnose, ignorant, prognosis) fear
xyl, xylo (xylem, xylene, xylophone, xylose) good
athl (athlete, athletic, triathlon, pentathlon, decathlon) know
eu (eugenics, eulogy, euphemism, euphony, euphoria) out
exo (exodus, exoskeleton, exothermic, extrovert) wood