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Noct/o
night
Olig/o
little
Oma
tumor
Ophthalm/o, Ocul/o, Opt/o
eye
Opia, Opsia
vision
Or/o
mouth
Orth/o
straight
Osis
abnormal condition
Oste/o, Osse/o
bone
Ot/o
ear
Para
near
Pathy
disease
Pelv/o, Pelv/i
pelvis
Penia
decrease
Pepsia
digestion
Peri
around
Phagia
eat
Phalang/o
fingers & toes
Pharyng/o
pharynx
Phasia
speech
Philic
love
Phleb/o
vein
Phobia
fear
Plasia, Plasm
form
Plasty
surgical repair
Plegia
paralysis
Pleur/o
pleura
Pnea
breathing
Pneum/o
lung
Poiesis
formation
Poly
many
Post
after