| Word | Definitions | Synonyms |
|---|---|---|
| pion | (noun) a meson involved in holding the nucleus together; produced as the result of high-energy particle collision | Synonyms: pi-meson |
| pioneer | (noun) one of the first colonists or settlers in a new territory | - |
| (noun) someone who helps to open up a new line of research or technology or art | Synonyms: groundbreaker, innovator, trailblazer |