| quaternary ammonium c. |
an organic compound containing a quaternary ammonium group, a nitrogen atom carrying a single positive charge bonded to four carbon atoms, e.g., choline.
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| quaternary c. |
one composed of four elements.
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| quaternary s. |
the geometric arrangement of the subunits of a macromolecule.
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| Quatrefages' a. |
parietal a.
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| Quatrefages' angle |
parietal angle.
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