American Heritage Dictionary
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Century Dictionary
GNU Webster's 1913
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WordNet
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Elsewhere on the web
The mineral iron is used in forming hemoglobin, which is essential in holding the oxygen in the blood as they are being transported to various parts of the body.— Find Free Articles - ArticlesBase
What's left is not much more than a cell with hemoglobin, the molecule that red blood cells use to carry the oxygen that the bloodstream delivers throughout the body.
Many biologically important colored molecules such as hemoglobin -- an oxygen-transport protein in red blood cells -- absorb light but do not fluoresce.— innovations-report
Anemia treatment - hemoglobin is the substance in red blood cells that carries vital oxygen around the body.— Health News from Medical News Today
This pigment results from the breakdown of hemoglobin, the oxygen-carrying protein of the red blood cells.— Medindia Health News

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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