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 hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up