Word root/ prefix	Root Meaning	Words based on the Root
Numer	Number	Enumerate - to mention a number of items on a list Numerology - the study of magical uses of numbers Numerous - a large number.
Oct/a/o	eight	Octagon - a figure with 8 sides and 8 angles Octogenarian - person in his or her 80s Octopus - sea animal with 8 arms.
Omni	all	Omnipotent - with all the power Omniscient - knowing all things Omnivorous - eating all foods.
Opt	best	Optimal - the best, the most desirable Optimize - to make the best of Optimum - the best something could be
Ortho	straight	Orthodontist - a dentist that straightens teeth Orthopedic - a doctor concerned with the proper alignment of the bones Orthography - the correct way of writing.

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