Oo-
Egg
Opthalm-
Eye
Opt-
Eye
Orb-
Circle, round, ring
-Orium, -ory
Places for something
Ornith-
Bird
Orth-
Straight, correct, right
Oscu-
Mouth
-osis
Abnormal condition
Oste-
Bone
Oto-
Ear
-ous
Full of
Ov-
Egg
Oxy-
Sharp, acid, oxygen
Pachy-
Thick
Paleo
Old, ancient
Palm-
Broad, flat
Pan-
All
Par-, para-
Beside, near, equal
Path-, pathy
Disease, suffering
-ped-
Foot
-ped- (2)
Child
Pent-
5
Per-
Through
Peri-
Around
Permea-
Pas, go
Phag-
Eat
Pheno-
Show
-phil-
Loving, fond of
Phon-, -phone
Sound
-phore, -pher
Bear, carry
Photo-
Light
Phren-
Mind, diaphragm
Phyc-
Seaweed, algae
Phyl-
Related group
-phyll
Leaf
Physic-
Nature, natural qualities
Phyt-. Phyte
Plant
Pino-
Drink
Pinni-
Feather
Plan-
Roaming, wandering
Plasm-, -plast-
Form, formed into
Platy-
Flat
Pleur-
Lung, rib, side
Pneumo-
Lungs, air
-pod
Foot
Ply-
Many, central
Por-
Opening
Port-
Carry
Post-
After, behind
Pom-
Fruit
Pre-
Before, ahead of time
Prim-
First
Pro-
Foward, favoring, before
Proto
First, primary
Pseudo-
False, deceptive
Psych-
Mind
Pter-
Having wings or fins
Pulmo-
Lung
Puls-
Drive, push
Pyr-
Heat, fire
Quadr-
4
Quin-
5
Radi-
Ray
Re-
Again, back
Rect-
Right, correct
Ren-
Kidney
Ret-
Net, made like a net
Rhag-, rrhage-
Burst foward
Rhe, rrhea
Flow
Rhin-
Nose
Rhiz-
Root
Rhodo-
Rose
Roto-
Wheel
Rubr-
Red
Sacchar-
Sugar
Sapr-
Rotten
Sarc-
Flesh