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Medical Word Parts - Letter: o

Term	Definition
ob-	against
obstetr/o	midwife
oct-	eight
ocul/o	eye
odont/o	tooth
odyn-	pain
-oid	resembling
-ole	small, little
oleo-	oil
olfact/o	smell
olig/o	few, scanty
om/o	shoulder
-oma	tumor, neoplasm
omphal/o	umbilicus (navel)
onc/o	swelling, tumor
onych/o	fingernail, toenail
oophor/o	ovary
ophry/o	eyebrow
ophthalm/o	eye
-opia	vision condition
opisth-	behind
-opsy	process of viewing
opt/o	eye, vision
or/o	mouth
orchid/o	testicles
-orexia	appetite
organ/o	organ
ori-	mouth
orth/o	straight
osche/o	scrotum
oscill/o	swing
-ose	a carbohydrate
-osis	abnormal condition
osm/o	sense of smell
oss/e	bone
oss/i	bone
oste/o	bone
ot/o	ear, hearing
-ous	pertaining to
ov/o	egg, ovum
ovari/o	ovary
ox/i	oxygen
ox/o	oxygen
oxa-	oxygen
oxy-	sharp, oxygen

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