There are 2 definitions of Ig in English:

Ig1

Syllabification: Ig

abbreviation

Immunoglobulin.

Definition of Ig in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal

There are 2 definitions of Ig in English:

IG2

Syllabification: IG

abbreviation

1Indo-Germanic.
1.1Inspector General.