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Answer for the clue "An antibody that causes precipitation when it unites with its antigen ", 10 letters:
precipitin

Word definitions for precipitin in dictionaries

Wiktionary Word definitions in Wiktionary
n. Any antibody that reacts with an antigen to form a precipitate.

Wikipedia Word definitions in Wikipedia
A precipitin is an antibody which can precipitate out of a solution upon antigen binding.

WordNet Word definitions in WordNet
n. an antibody that causes precipitation when it unites with its antigen

Usage examples of precipitin.

McReady held a test tube with white precipitin settling slowly from straw-colored serum.

McReady held a test-tube with white precipitin settling slowly from straw-colored serum.

Two minutes later, McReady held a test tube with white precipitin settling slowly from straw-colored serum.