Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X, list of scientific terms with Scottish connections).
This entry has not been updated since then but may contain minor corrections and revisions.
COUPER. In phr. Couper-Kekulé theory of molecular structure, the theory of valency as applied to the carbon compounds in 1858 by Archibald Scott Couper (1831–92), of Kirkintilloch, propounded independently at the same time by F. A. Kekulé in Germany.
