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Medical TERMINOLOGY   -   A thru Z

Prefixes, roots, suffixes  [ O ]

Prefix: A prefix is placed at the beginning of a word to modify or change its meaning. Pre means "before." Prefixes may also indicate a location, number, or time. 
Root
: central part of a word.     
Suffix
:  The ending part of a word that modifies the meaning of the word. Example: homeless. Root = 'home' and the suffix is 'less'. It can also refer to a condition, disease, disorder, or procedure.    

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Also check out the medical abbreviations section
 

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Term
arrow   Meaning
obstetr/o arrow   pregnancy; birth
ocul/o arrow   eye
odont/o arrow   tooth
odyn/o arrow   pain
-oid arrow   resembling; derived from 
-ole arrow   little; small 
ole/o arrow   oil 
olecran/o arrow   olecranon (elbow) 
olig/o arrow   scanty
om/o arrow   shoulder
-oma arrow   tumor; mass; fluid collection 
omphal/o arrow   umbilicus (navel) 
onc/o arrow   tumor
-one arrow   hormone
one arrow   mono, uni 
one and a half arrow   bi, di 
onych/o arrow   nail (of fingers or toes) 
o/o arrow   egg
oophor/o arrow   ovary
-opaque arrow   obscure
ophry/o arrow   eyebrow
ophthalm/o arrow   eye
-opia arrow   vision condition 
opisth/o arrow   backward, behind 
-opsia arrow   vision condition 
-opsy arrow   view of 
opt/o arrow   eye; vision 
optic/o arrow   eye; vision 
-or arrow   one who 
or/o arrow   mouth
orch/o arrow   testis
orchi/o arrow   testis
orchid/o arrow   testis
-orexia arrow   appetite
organ/o arrow   organ
orth/o arrow   straight
osche/o arrow   scrotum 
-ose arrow   full of; pertaining to; sugar 
-osis arrow   condition, usually abnormal 
-osmia arrow   smell
osphresi/o arrow   sense of smell 
ossicul/o arrow   ossicle (small bone) 
oste/o arrow   bone
-ostosis arrow   condition of bone 
ot/o arrow   ear
-otia arrow   ear condition 
-ous arrow   pertaining to 
ov/o arrow   egg
ovari/o arrow   ovary
ovul/o arrow   egg
ox/o arrow   oxygen
-oxia arrow   oxygen
oxy- arrow   swift; sharpp; acid 
oxysm/o arrow   sudden
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Medical Calculators - A thru Z
Lab Values - A thru Z