There are 2 definitions of Ig in English:

Ig1

Line breaks: Ig

abbreviation

Biochemistry
Immunoglobulin.

Definition of Ig in:

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Word of the day glee
Pronunciation: gliː
noun
great delight, especially from one's own good fortune…

There are 2 definitions of Ig in English:

IG2

Syllabification: IG

Entry from US English dictionary

abbreviation

1Indo-Germanic.
1.1Inspector General.

Definition of Ig in: