noun
oxygen absorber; oxygen scavenger
A small packet placed in packaged food to absorb oxygen and prevent oxidation; commonly found in snacks like senbei or dried foods.
せんべいの袋に脱酸素剤が入っている。
There is an oxygen absorber inside the rice cracker bag.
Compound of 脱 (datsu, 'remove') + 酸素 (sanso, 'oxygen') + 剤 (zai, 'agent').