There are 2 definitions of Hb in English:

Hb1

Syllabification: Hb

symbol

Hemoglobin.

Definition of Hb in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict

There are 2 definitions of Hb in English:

HB2

Syllabification: HB

abbreviation

1Half board.
1.1 (also hb) Hardback.
1.2Hard black (used in describing a medium grade of pencil lead).
1.3The political wing of the Basque separatist organization ETA.
[abbreviation of Basque Herri Batasuna 'United People']

Definition of Hb in: