An archaic or extremely rare variant term referring to multiple types of antiserums or a collection of antiserum preparations.
A redundant or dialectal form combining antiserum + sera (plural of serum), likely from early medical terminology where precision in plural forms was inconsistent.
This word is so obscure it barely appears in any modern dictionary—it's the kind of term that shows how messy medical language used to be before standardization, when doctors mixed Latin and Greek plurals unpredictably.
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