- Prevotella intermedia
- Prevotella melaninogenica
- Prevotellaceae
- Priapism
- Pridopidine
- Prilocaine
- PrimPol
- Primaquine
- Primary active transport
- Primary age-related tauopathy
- Primary alcohols
- Primary amenorrhea
- Primary amines
- Primary amoebic meningoencephalitis
- Primary auditory cortex
- Primary biliary cholangitis
- Primary biliary cirrhosis
- Primary bronchi
- Primary care behavioral health
- Primary carnitine deficiency
- Primary central nervous system lymphoma
- Primary cilia
- Primary ciliary dyskinesia
- Primary consciousness
- Primary cutaneous amyloidosis
- Primary cutaneous follicle center lymphoma
- Primary cutaneous marginal zone lymphoma
- Primary dentition
- Primary effusion lymphoma
- Primary health care
- Primary hyperaldosteronism
- Primary hyperparathyroidism
- Primary immunodeficiency disorders
- Primary lateral sclerosis
- Primary mediastinal (thymic) large B-cell lymphoma
- Primary mediastinal B-cell lymphoma
- Primary mediastinal large B cell lymphoma
- Primary metabolites
- Primary motor cortex
- Primary nursing
- Primary olfactory cortex
- Primary peritoneal carcinoma
- Primary pigmented nodular adrenocortical disease
- Primary polydipsia
- Primary progressive aphasia
- Primary reinforcer
- Primary sclerosing cholangitis
- Primary sensory areas
- Primary sexual characteristics
- Primary somatosensory cortex
- Primary standard
- Primary transcripts
- Primary tuberculosis
- Primary tumors
- Primary visual cortex
- Primase
- Prime editing
- Prime mover
- Primer binding site
- Primer dimer
- Primer extension
- Primidone
- Primigravida
- Priming
- Priming effect
- Primitive atrium
- Primitive neuroectodermal tumor
- Primitive reflexes
- Primitive streak
- Primordial dwarfism
- Primordial follicles
- Primordial germ cells
- Primordial soup
- Primrose oil
- Principal component regression
- Principal coordinate analysis
- Principle of least effort
- Pringle manoeuvre
- Prinomastat
- Prion
- Prion diseases
- Prion protein
- Prions
- Priority review
- Prism adaptation
- Prism cover test
- Prisoner's dilemma
- Pristane
- Pristanic acid
- Pristinamycin
- Pristinamycin IA
- Privacy for research participants
- Private duty nursing
- Private speech
- Pro re nata
- Pro-oxidants
- Proadifen
- Proanthocyanidin
- Proarrhythmia
- Probability sample
- Proband
- Probenecid
- Probes
- Probiotics
- Problem formulation
- Problem solving
- Problem-based learning
- Problem-focused coping
- Problematic social media use
- Proboscis
- Probucol
- Procainamide
- Procaine
- Procalcitonin
- Procarbazine
- Procaterol
- Procedural knowledge
- Procedural memory
- Procedure codes
- Procerus
- Procerus muscle
- Process development
- Process flow diagrams
- Process safety
- Processed meat
- Processing
- Processing fluency
- Processing speed
- Processus vaginalis
- Prochlorperazine
- Procidentia
- Procoagulant
- Procollagen
- Procrastination
- Proctalgia
- Proctitis
- Proctocolectomy
- Proctocolitis
- Proctodeal
- Proctodeum
- Proctoscope
- Proctoscopy
- Procyanidin
- Procyanidin A1
- Procyanidin B1
- Procyanidin B2
- Procyanidin B3
- Procyanidin dimer
- Procyclidine
- Procymidone