Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
FEICHAM, n. Spirits of salt, hydrochloric acid (Ags. 1916 T.S.D.C. II.): used by plumbers and tinsmiths. [′fi:çəm]
[From Feech, int., because of its acrid smell, + -um.]