(biochemistry) proline

propolis (aromatic, glue-like substance used by bees in hive construction)

provitamin

(radio-controlled car hobby fandom) Short for プロポーショナル.

police dog

attach, affix, stick, fasten, add, add on, append; set, put, put one thing on another / apply, put on / leave a mark on / write, make an entry / give, impart, direct, direct one's attention

(meteorology) psychrometer

to put on (a hat, gloves, etc.) / to wear (a necklace, glasses, etc.) / to carry (a sword, gun, etc.)

to let soak; to immerse / (specifically) to pickle

apply medicine