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A-Z Word Parts Find roots and affixes with example words Word Parts GuideWord Parts Guide

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Word part Type Origin Definition
op- prefix Latin towards; against; away
op, ops, opt, opto, ophthalm, ophthalmo, -opia, -opsy root Greek eye, visual condition, vision, sight, inspection
opt1 root Latin best
opt2 root Latin choose
orb root Latin wheel, circle
ord, ordin root Latin row, rank, order
orig root Latin beginning
ornith, ornitho root Greek bird
ortho root Greek straight, vertical, perpendicular; correct
-ory, -atory2 adjective-forming suffix Latin serving to, pertaining to
-ose1 adjective-forming suffix Latin having many or much of; tending toward
-ose2 noun-forming suffix Greek carbohydrate, esp. sugar
-osis noun-forming suffix Greek condition (usually medical)
-osity noun-forming suffix Latin state or condition of
oste, osteo root Greek bone
-otic adjective-forming suffix Greek having or related to (a condition or state)
oto, ot root Greek ear
-ous, -ious adjective-forming suffix Latin full of, characterized by
out- prefix Old English out, outside, outward; beyond, better, more
ov, ovi root Latin egg
over- prefix Old English excessively, too much; over, on top, above