Check words in Scrabble Dictionary and make sure it's an official scrabble word.
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Meaning of opsonin
1 definition found From WordNet (r) 3.0 (2006) [wn]: opsonin n 1: an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
WordNet ® Princeton University. http://wordnet.princeton.edu
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