PREFIXES AND SUFFIXES "roots suffix meanings" Questions

prefix and suffix of segregation SegregationSegregate "se" is the prefix meaning: "from" or "away" "greg" is the root of the word meaning "group" or "united" or "union""tion" is the suffix meaning ...

What does the prefix plac mean? What word has the prefix plac-? Surely you don't mean "place," which has no prefix. If you mean "placoderm," it means "plated" or "plate-like", and "-derm," means "skin