A substance or compound related to blood or blood pigments, particularly in older chemical terminology.
From Greek 'haima' (blood) + '-id' suffix indicating a substance or chemical compound. The term emerged in 19th-century chemistry when scientists were classifying blood-derived materials.
This word is like a fossil from the history of chemistry—it shows how scientists used to name things more casually based on their source material rather than their precise chemical structure. Today we'd probably call it something else entirely!
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