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.

Definition of heavy chain in:

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Word of the day flagitious
Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous