Wiktionary
n. A replacement or substitute.
Usage examples of "replacer".
The essential thing was to get him on oxygen as fast as possible, then hook him up to a fluid replacer, a heme carrier: he was bleeding so badly that oxygen starvation was the biggest danger.
Although it seems unlikely that anyone would bother genetically modifying goats to produce cat milk—especially when a perfectly reliable cat milk replacer has been on the market for years—that's the kind of detail any writer might invent to make their near future world a bit more solidly real.
She had never heard of the Exotic Psychology Office before, which suggested it might be very new on Notcideven newer than the replacers of the exploiters.
She had never heard of the Exotic Psychology Office before, which suggested it might be very new on Notcid—even newer than the replacers of the exploiters.