| Term | Definition |
| pachy- | thick |
| palat/o | palate |
| pale/o | early, primitive, old |
| palpebr/o | eyelid |
| pan- | all |
| pancreat/o | pancreas |
| pant/o | whole, all |
| papill/o | nipple, optic disc |
| papul/o | papule, pimple |
| -para | to bear offspring |
| para- | similar, beside |
| -paresis | weakness, slight paralysis |
| -partum | childbirth |
| path/o | disease |
| -pathy | disease |
| pector/o | chest |
| ped/o | child, foot |
| pelv/i | pelvis |
| -penia | deficiency |
| penta- | five |
| -pepsia | digestion |
| peri- | around, surrounding |
| pericardi/o | pericardium |
| perine/o | perineum (surface region in both males and females between the pubic symphysis and the coccyx) |
| peritone/o | peritoneum (serous membrane lining the abdominal cavity) |
| pero- | deformed |
| pest/i | pests, plague |
| -petal | moving forward |
| petr/o | stone, stone-like hardness |
| -pexy | surgical fixation |
| phac/o | pertaining to lens |
| phag/o | eat, swallow |
| -phagia | eating, swallowing |
| -phagy | eating, devouring |
| phak/o | pertaining to lens |
| phall/o | penis |
| pharmac/o | drugs |
| pharyng/o | throat |
| phas/o | speech |
| -phasia | speech |
| -pheresis | removal |
| -phil | attraction |
| phil/o | attraction |
| -philia | affinity for |
| phleb/o | vein |
| phlebo- | vein |
| phob/o | fear, adversion |
| -phobia | abnormal fear |
| phon/o | sound, voice |
| phor/o | to carry |
| phot/o | light |
| phreni- | diaphragm, mind |
| phyl/o | race, species, type |
| -phylaxis | protection |
| phyllo- | leaf |
| physi- | physical, natural |
| -physis | growth, growing |
| physo- | swelling, gas |
| phyt- | plants |
| pico- | one trillionth |
| -piesis | pressure |
| piez/o | pressure |
| pil/o | hair |
| pituitar/o | pituitary |
| -plakia | patches |
| plan/o | flat, plan, level |
| plani- | flat, level |
| -plasm | formation |
| plasmo- | plasma |
| plast/o | formation |
| -plasty | surgical repair |
| platy- | broad, flat |
| -plegia | paralysis |
| pless/i | striking, percussion |
| pleur/o | pleura, rib |
| plic/o | fold |
| pluri- | several, more |
| -pnea | breathing |
| pneo- | air, breath, breathing |
| pneum/o | lung, air |
| pneumon/o | lung |
| -pod | foot |
| -poiesis | production, formation |
| poikil- | irregular, varied |
| polio- | gray |
| poly- | many |
| pono- | fatigue, exhaustion, overwork |
| por/o | passage, opening, duct |
| -porosis | decrease in density |
| -posia | drinking, fluid intake |
| post- | after, behind, back |
| -prandial | meal |
| -praxia | to perform, action |
| pre- | before, in front of |
| presby/o | old age |
| primi- | first |
| pro- | before, in front of |
| proct/o | anus and rectum |
| pros/o | forward, anterior |
| prosop/o | face |
| prostat/o | prostate |
| prote/o | protein |
| proto- | first |
| proxim/o | nearest |
| psamm/o | sand |
| pseud- | false |
| pseudo- | false |
| psor/o | itching |
| psych/o | mind |
| -pterygium | abnormality of conjunctiva |
| -ptosis | drooping, prolapse |
| ptyal/o | saliva |
| -ptysis | spitting |
| pub/o | pubic, pubes |
| pulm/o | lung |
| pulmon/o | lung |
| puls/o | beating, to beat |
| -puncture | to pierce a surface |
| pupill/o | pupil |
| purpur/o | purple |
| purul/o | pus formation |
| py/o | pus |
| pyel/o | renal pelvis |
| pyg/o | buttocks |
| pykn/o | thick, dense, compact |
| pyl/e | portal vein |
| pylor/o | pylorus (opening between the stomach and duodenum) |
| pyr/o | fire, fever |
| pyret/o | fever |
| pyrex/o | fever |