- preformed billet
- prefractal
- prefractionator
- preframe
- prefrontal cortex
- pre-galactic cloud
- pre-galactic nucleosynthesis
- pre-galactic star
- pre-Galaxy
- pre-galaxy
- preganglionic neurofibre
- preganglionic neuron
- pregelatinized starch
- pre-geometry
- pregermlayer stage
- P-region
- preglabellar field
- pre-glottalization
- pregnancy
- pregnancy anabolism
- pregnancy-associated thrombocytopenia
- pregnancy diagnosis
- pregnancy diagnosis in domestic animals
- pregnancy identification
- pregnancy in rudimentary horn