Plural of formol; multiple samples, types, or containers of formaldehyde-based solutions used in laboratories.
From formol + -s (regular English plural marker). The plural is straightforward from the singular chemical term.
The plural formols shows how scientific vocabulary creates its own grammar worlds—while a biologist might casually mention 'three different formols in the lab,' a historian could track the word's rise and fall across decades in medical literature.
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