Clissus vel clistus, (from Clyssus 2256 to wash). Among the ancient chemists, this word imported an extract prepared of various substances mixed together. Among the moderns, it signifies a mixture, containing the various productions of one substance united with each other; e. g. when the distilled water, the spirit, the oil, the tincture, and the salt of wormwood, are so blended, that the mixture is possessed of all the united virtues of the simple, from which these preparations are obtained. Clyssuses were formerly prepared from the vapours of different matters joined with nitre, several instances of which may be seen in the Dictionary of Chemistry; and as their virtues merit not the trouble of preparing them, the curious are referred to that work.

Clyssus antimonii, Clyssus mineralis. It is obtained by deflagrating a mixture of antimony, nitre, and sulphur, in a red hot retort, fixed to a receiver, in which is some water. But as it is only a weak spirit of sulphur, it is not worth the labour of preparing. It is recommended as an antiseptic, and as useful in early stages of hectics. See Dict, of Chemistry, and Neumann's Chemical Works.