Plural of hematic; substances, medicines, or remedies that affect or improve blood; blood tonics or treatments.
From hematic (relating to blood) plus -s for plural. Historically, hematics referred to medicines believed to strengthen or purify the blood.
Hematics were a huge part of pre-scientific medicine—doctors prescribed iron tonics, bloodroot, and other 'hematics' to treat everything from anemia to melancholy!
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