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Hb

1 American  
Symbol, Biochemistry.

  1. hemoglobin.

HB 2 American  

abbreviation

  1. hard black: a designation for a graphite pencil of medium hardness.

  2. Brinell hardness number.

  3. U.S. Government. House Bill.

h.b. 3 American  

abbreviation

Football.

  1. halfback.

HB 1 British  

symbol

  1. hard-black: denoting a medium-hard lead Compare H B

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Hb 2 British  

symbol

  1. haemoglobin

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Low values of red blood cell count, or RBC, hemoglobin, or Hb, and hematocrit, or HCT, would indicate that the patient is suffering from anemia.

From Salon • Feb. 7, 2024

Thalassemia is a rare genetic disease caused by a defect in either the alpha or the beta subunit of Hb.

From Textbooks • Jun. 9, 2022

The oxygen dissociates from the Hb molecule, shifting the oxygen dissociation curve to the right.

From Textbooks • Jun. 9, 2022

It is easier to bind a second and third oxygen molecule to Hb than the first molecule.

From Textbooks • Jun. 9, 2022

The capital letter H with different Greek subscript letters, used to designate symbols of hydrogen: Ha, Hb, etc.

From The Uses of Italic A Primer of Information Regarding the Origin and Uses of Italic Letters by Hamilton, Frederick W. (Frederick William)

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.