Definition of "reducer" [re•du•cer]

• Something that reduces. (noun)
• A liquid used in the process of developing a negative to reduce its darkness. (noun)
• A component used to connect two pipes of different bores. (noun)

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• "Reducer: As the name suggests, a reducer is a fitting used to reduce from one pipe size to another."
• "Popular stomach acid reducer ups patients 'risk of developing pneumonia threefold WASHINGTON - Researchers at Wake Forest University School of Medicine have found that a popular stomach-acid reducer, which is used to prevent stress ulcers in critically ill patients who need breathing machine support, triples the likelihood of contracting pneumonia among such patients."
• ""Probably the most popular gear reducer style in conveyor applications is the worm gear reducer, which is a perfectly good reducer for many applications," Mintz says."