Definition of heavy chain in English:

heavy chain

Syllabification: heav·y chain

Entry from US English dictionary

noun

Biochemistry
  • The protein subunit that, as one of a pair, makes up the major part of an immunoglobulin molecule.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody