a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film
a person who directs and restrains
- As we talked, I felt a joy I could not restrain.
- He couldn't restrain his curiosity.
- If I don't restrain my dog, it chases the cat.
- I couldn't restrain my laughter.
- She couldn't restrain her anger at this insensible attitude of theirs.
- The government has taken measures to restrain inflation.