A unit of measurement, typically used in biology or physics, though often context-specific and not standardized.
The origin is uncertain; it may be named after a scientist or derived from a technical abbreviation, but its etymology is obscure in modern English dictionaries.
This word is so specialized and obscure that it barely shows up outside very particular scientific fields—it's a reminder that English has thousands of technical terms that function perfectly well in narrow communities but never become common knowledge.
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