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salso-acid

ˈsalso-ˈacid, a. and n. Obs.
  [f. salso-, assumed comb. form of L. salsus adj., salt.]
  a. ‘Having a taste compounded of saltness and sourness’ (J.). b. n. A substance partaking of the qualities of a ‘salt’ and an ‘acid’.

1697 Sir J. Floyer Enq. Baths 17 Salso-acid Baths. Ibid. 20 Salso-acid Medicines. 1707Physic. Pulse-Watch 335 Salso Acids, volatile Salt, or fix'd Vitriolate, Sal Catharticum is a nauseous, bitterish, Salso Acid.

Oxford English Dictionary

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