There are 2 main definitions of Hb in English:

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Hb 1

Line breaks: Hb

symbol

Haemoglobin: your Hb level will be tested early in pregnancy

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There are 2 main definitions of Hb in English:

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HB 2 Line breaks: HB

abbreviation

1.1 (also hb) Hardback: £12.99 hb/£8.99 pb
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']

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Word of the day exemplum
Pronunciation: ɪɡˈzɛmpləm
noun
an example or model...